Thoughts like these are especially prevalent when it comes to the devoted owners of BlackBerrys and iPhones. All too often, the people carrying these smart phones are curious about what one device has that the other lacks. This week, I’m going to save you the trouble and outline some of the personal usage ups and downs to each device.

Because I regularly use both gadgets and am accustomed to their different features, I have included fresh observations from five people who recently switched from BlackBerrys to iPhones. At my request, these people kept track of their impressions, noting the things they missed on their BlackBerrys along with things they preferred on the iPhones. This column isn’t meant to promote one device over the other; rather, it is a summary of some people’s sentiments, combined with my own observations in hopes of enlightening readers. I inevitably left out some differences.

The most outstanding observation from my switch group in favor of the iPhone was an appreciation for its applications, or apps.

They used things like driving directions for the first time because these apps looked and worked better on the iPhone than on the BlackBerry. And they went through a downloading frenzy during which time they found all sorts of apps for the iPhone, such as games, entertainment and those that enhanced business-travel productivity. “Browsing for games. Probably should leave the office now,” said one person’s notes.

Though Research in Motion’s (RIMM) BlackBerrys also run apps (including some of the same ones as for the iPhone), BlackBerry’s App World offers only a little better than 2,000 apps. Apple’s (AAPL) App Store boasts more than 65,000. A shortcut to the App Store ships preloaded on iPhones. BlackBerry App World is preloaded or virtually preloaded by carriers at their discretion, so a shortcut to App World may not be visible.

My switchers were frustrated by the iPhone’s battery life and complained of running low on battery. One person said, “I need to charge my iPhone a couple of times throughout the day which can be inconvenient, especially when traveling. With my BlackBerry I just charged it while I slept and it was good to go for the day.”

Granted, these people were all using the iPhone 3GS and had previously used various models of BlackBerrys that ran on slower networks and had smaller screens—two features that require less battery. Still, worrying about running out of juice is a hassle. One person said his iPhone’s weak battery was a tribute to the fact that he used it more often and for more things than he did the BlackBerry.

The most obvious difference between iPhones and BlackBerrys are the keyboards. The iPhone uses an on-screen keyboard, while the BlackBerry (except the touch-screen Storm model) uses a tactile QWERTY keyboard. As expected, the switchers had trouble using the iPhone keyboard–especially for the first few days. But after about a week, most people in the group had adjusted well to the on-screen keys and the iPhone’s auto-correct feature that fixes mistakes as long as you keep typing rather than stopping to fix an error. One person said, “I was a skeptic, and didn’t think the typing would work for me at all, but it actually hasn’t been too bad.”

Another said typing can be a real challenge at first, but that this could be overcome with a bit of practice.

Several people said they were still able to use their thumbs for iPhone typing as they did on the BlackBerry, though most preferred turning the screen horizontally to do this with slightly larger keys. Some said that they weren’t typing quite as fast as with the BlackBerry’s QWERTY keys but that they weren’t too far off.

The BlackBerry keyboard’s static position below its screen means all letters, numbers and symbols must come solely from pressing those keys; this is done by pressing ALT or Shift keys for numbers and symbols. Some switchers noted that pressing a button to change the iPhone’s on-screen keyboard from letters to capital letters or numbers took a bit longer than on the BlackBerry.

My switchers were ecstatic about using the iPhone’s Safari Web browser. They enthusiastically said searching, browsing and reading were all made much better and more visually pleasing compared with their experiences on the BlackBerry browser.

If you are a BlackBerry user, you know that all received and sent emails are listed on the same screen. The iPhone behaves more like a computer, storing sent emails in a special folder you must back up to open. This takes a little while to get used to.

Some switchers said they wished the iPhone had something like BlackBerry Messenger, the always-on messaging system that works to allow communication between all BlackBerrys.

The iPhone automatically changes its time when you enter a new time zone. BlackBerrys remain set to their home time zone for time stamping all emails with that time–unless you change the time in settings.

RIM prides itself on being able to run multiple applications at once; the iPhone allows this with its own preloaded programs like Mail and Safari, but not with other apps.

One switcher, for example, was frustrated that Pandora, a radio-like app that plays music according to user likes and dislikes, turned off when he opened Mail to read emails while listening to songs.

The BlackBerry’s AC adaptor takes up two power outlet spots, while the small, square iPhone plug occupies only one outlet, making it more versatile and able to charge in more locations.

The iPhone only works on one cellular service: AT&T (T). The BlackBerry is available from Verizon (VZ), AT&T, T-Mobile, Sprint (S) and other carriers. My group used T-Mobile before changing to the iPhone’s AT&T service.

There will always be something on someone else’s device that looks more appealing than the one in your hand.

But the experience of using apps on the iPhone–and the huge selection of apps in the App Store–significantly enhance Apple’s device.

RIM is continually improving its own store, but it needs to move quickly to keep its loyal users contented.

Edited by Walter S. Mossberg

Write to Katherine Boehret at mossbergsolution@wsj.com

This week, I tested Peek, a device that might bridge the gap between these two camps. It’s made for those who don’t intend to become consumed with mobile email, and don’t need a combination phone, Internet, digital camera and email gadget. Yet from time to time, these people wish they had a better way to check emails without going home and turning on their computers.

The $100 Peek (GetPeek.com) sends and receives emails for $20 a month.

Since I fit the constantly-checking-email description, I enlisted the help of someone who falls squarely into the category that Peek is targeting: my mother. Mom is constantly on the go, working on one project or another, and she doesn’t have time to consistently check her email. On more than one occasion, I’ve had to call her to talk about emails I sent that she didn’t yet read.

Stylish and Simple

Peek is a stylishly thin device that, to a mobile email novice, could pass for a BlackBerry. It receives and sends email, period. Peek doesn’t have a Web browser, phone or built-in digital camera. It’s sold for $100 at Target and GetPeek.com, and costs $20 monthly for contract-free service. Most email accounts work with this gadget, including Hotmail, Yahoo, Gmail and AOL, and up to three accounts can be set to work on each device.

Peek Inc., a New York company that was started by former Virgin Mobile USA (VM) employees, mailed a Peek to my mom in Pennsylvania, and she has been using it for about a week with positive results.

I, too, tested a Peek, but I was more interested in my mom’s feedback since, prior to this test, she hadn’t used a mobile email device and I use two different ones — regularly. Overall, I’d suggest waiting until November to buy a Peek due to a handful of improvements that the company plans to add by then.

Winning Over a Novice

My mom got the hang of Peek almost instantly and found it both helpful and relatively easy to use. She liked its full keyboard and the way most of its keys lit up and were familiarly placed like those on a computer keyboard — a feature I take for granted on my BlackBerry. Its price and stylish, thin look appealed to her, too. She tested an Aqua Blue Peek — though the device also comes in Black Cherry and Charcoal Gray. I knew Mom was catching on when she casually sent a message from her Peek late one night using the subject line, “What’s Up?”

My mom suggested a few improvements, and I agreed with all of them. The Peek can vibrate, chime and glow blue when new emails are received, but none of these indicators are particularly noticeable. For example, the chime sounds only once and neither my mom nor I could always hear it — even at its loudest setting — especially if it was in a purse. A blue indicator light on the Peek glows once every 10 seconds for 10 minutes after an email is received, but goes idle after that.

The font used on the Peek’s screen could stand to be a little bigger. My mom found words typed in all capital letters were easier and faster to read than the regular font, but she thought most people wouldn’t have too much trouble while using their glasses.

Peek Inc. says that by November, it will have added a louder chime, a constantly blinking indicator light and a larger font to the device. Also in November, people who purchase 12 months of service at once will get an extra month free.

Compared with my BlackBerry Curve, the Peek was thinner but I found its buttons and side scroll wheel a bit stiff. And Mom and I both found that the oft-used Space bar key was too tough to press down.

One Inbox, Three Accounts

The Peek’s straightforward system uses one inbox view (in which up to three email accounts are combined), one menu and a side scroll wheel for selecting commands. And though my mom didn’t seem to mind, the device’s overall navigation system came off as a bit clumsy to me. For example, rather than selecting an email to read it, I had to select an email, and then choose “Open Email” from a menu list. On most other devices, this can be done with one step.

But some BlackBerry tricks are built into the Peek, such as touching “T” to automatically go to the top of an email or inbox; “B” to go to the bottom; or “N” to move to the next email without navigating back to the inbox list. Likewise, the space bar serves as a built-in Page Down button. And holding a letter down will capitalize it.

Photo attachments can be easily opened on the Peek, though attached documents from programs like Word and Excel won’t open up.

Synching Contacts

A simple step lets users synchronize their email account’s contact list with the Peek. My mom did this with an AOL account, and I did it with Hotmail, Gmail and .Mac accounts. Peek devices automatically check for email every two to five minutes, or if users can’t wait two minutes, they can initiate a Send/Receive manually and see an up-to-date queue of emails.

Peeks each have eight megabytes of usable memory, which can hold about 5,000 emails. Once a device reaches capacity, an on-screen prompt asks permission to delete the 500 oldest emails. Peek Inc. says a full battery charge will last about five days if a device handles around 10 to 15 emails a day; power users who send and receive 200 to 300 emails a day will get about two days of use from a full charge.

When asked, my mom concluded that she would probably buy a Peek, but said she still wasn’t sure that she had an urgent need to see email all that often. She also noted that Peek could become a Pandora’s box of sorts for people who, as they use it more often, might want to get more out of it — such as Google searches or other Web browsing.

Peek serves a purpose: It gives those who don’t belong to the “I-check-my-email-constantly” club a way to “peek” in on their emails and not feel so unplugged from friends and family. That alone, is reason enough to buy my mom one of these devices.

– Edited by Walter S. Mossberg

• Email us at mossbergsolution@wsj.com. Find this and other columns and videos online free at the All Things Digital Web site: http://walt.allthingsd.com

This week I took a look at some options for people who want to get rid of old electronics, one way or another. The good news is that there are a handful of Web sites that make it easy to do this — and some of them may even pay you for your old products. The bad news is that you’ll likely receive only a fraction of what you originally paid, especially if you waited a while to get rid of it.

Some sites, like Gazelle.com and VenJuvo.com, offer cash for your items and/or will recycle products. Another site, TechForward.com, lets people pay a fee to “lock in” a value for how much the site promises to pay for the product in the future. MyBoneYard.com accepts only laptops, desktop PCs, cellphones and flat-panel monitors, and gives Visa (V) gift cards rather than cash.

I was surprised to receive significantly different value offers from Gazelle and VenJuvo when trying to sell the exact same products on each site. In one instance, VenJuvo offered me $30 more than Gazelle for a digital camera; another time, I got $15 more from Gazelle for an old Apple (AAPL) iPod. It’s worth the extra step to shop around at more than one of these sites before getting rid of something.

Both ask a few questions about the item, including its condition and whether or not it still has the accessories that originally came with it. Gazelle determines a product’s value using retail — think Amazon (AMZN) and eBay (EBAY) — and wholesale channels; VenJuvo uses similar criteria and also looks at competitors’ prices.

If you worry about someone stealing your digital data, you’ll likely not feel comfortable dropping something in the mail that’s chock full of personal information, especially if it no longer powers on to allow the owner to wipe this information.

Both Gazelle and VenJuvo accept at least some types of digital cameras, laptops, MP3 players, GPS devices, camcorders and gaming consoles. Gazelle also accepts cellphones. But they don’t take everything. Gazelle doesn’t take LCD TVs and VenJuvo doesn’t accept satellite radios and portable hard drives or any smartphones or cellphones other than the iPhone; neither accepts desktop PCs.

I took the closest look at newly released Gazelle, owned by Second Rotation Inc., and walked through the simple start-to-finish process of selling a gadget and receiving money from the site. After pulling up the site, people can find their product and its value by choosing from a list of nine categories or by typing some part of the product’s name into a search box.

I sold Gazelle a first-generation iPod Mini with four gigabytes of memory for which my boss paid $249 in 2004. I answered a few questions about the product: Yes, it still powered on; no, I didn’t have the original AC adapter, manuals or software installation CD, and it was in “excellent” condition, according to my assessment. Gazelle placed its value at $25.

At this step, I opted to add the iPod to my box and check out, but users can also add other items to a box, including electronics for recycling. Gazelle’s policy is that it pays 100% of shipping costs for any box shipped to the company, so long as there’s at least one item in the box worth $1. Eighty percent of transactions qualify for a free box; the rest can be sent with printed-out prepaid shipping labels, but you must find packaging.

Gazelle lets users receive payments via a mailed, paper check or using PayPal; money is received either way within five business days. People can also donate their money to one of 23 causes, including the American Red Cross and World Vision. I opted for PayPal, and the $25 amount was deposited shortly after Gazelle received the iPod.

I sent the old iPod to Gazelle in a brightly colored, empty box that arrives at a customer’s door a few days after he or she sells the device to Gazelle. I secured the old iPod in the box using balled up paper, and sealed it with packing tape. A prepaid shipping label was already stuck to it, and I needed only drop it off at UPS.

If Gazelle receives a product and decides that it isn’t worth what you said it was — either more or less — and you’d rather not sell, the company will ship the product back, free of charge. But while Gazelle’s site guarantees users that they’ll receive their money, and that personal data are safe with the company, no money-back guarantee is offered.

Gazelle hopes to calm nerves by posting detailed instructions on the site about how to wipe a device of all private information. But the company hasn’t yet done this, and numerous users will remain skeptical even with such instructions.

I also poked around on VenJuvo Inc.’s Web site of the same name, www.VenJuvo.com, which is derived from two Greek words meaning “support, assist and delight sellers,” according to the company. This site, too, buys products back from people, though it pays via check, PayPal or Kmart (SHLD) gift card. Users fill out similarly simple questionnaires on each product to help assess value. Unlike Gazelle’s style of mailing boxes to users, VenJuvo gives users only prepaid shipping labels to print out and stick on a box that the customer must supply.

One notable difference between the sites is Gazelle’s broader range of products. In the case of digital cameras, for example, Gazelle accepts 80 brands while VenJuvo takes only Canon (CAJ), Sony (SNE), Olympus and Kodak (EK). Unlike with Gazelle, if you send VenJuvo a product that isn’t worth what you said it was, the company won’t return the product free-of-charge; instead, it will charge you for shipping.

If users choose to receive a gift card, they get a 10% added value. While VenJuvo doesn’t let people donate a product’s value to a cause, it will add this feature next week and will include different causes (like Ronald McDonald House and Big Brothers Big Sisters) than those found on Gazelle.

Unlike Gazelle, VenJuvo will always take items for recycling and will pay for the shipping, regardless of whether you traded something in for a value.

A useful resource for general electronics recycling is the Consumer Electronics Association Web site, www.MyGreenElectronics.org, which locates nearby electronics-recycling centers according to ZIP Code. And almost every computer manufacturer has a recycling program in place; some will even recycle computers that aren’t their own brand.

One way or another, it’s time to clean out the old junk drawer. Just be sure to do some comparison shopping if you want money for your old products.

Edited by Walter S. Mossberg

Write to Katherine Boehret at mossbergsolution@wsj.com