It doesn't get better than the Apple Watch Series 4. The new slimmer body and bigger screen make it sleeker and more stylish than ever before. The unique modern design works for both men and women. The smartwatch comes in 40mm and 44mm styles to fit wrists big and small. You can buy it in several finishes to match your style and there are dozens of Apple-made and third-party watch bands to make the Watch your own.

The touchscreen, button, and dial (what Apple calls the “crown”) help you zoom in and out and move between apps fairly effortlessly. With this easy navigation it’s easy to forget we’re typing on a screen slightly smaller than an Oreo. In particular, we loved Apple’s app homepage, which displays all of the apps as icons in a honeycomb-like display. You can use the touchscreen to move around, and the dial to zoom in or pan out, to precisely tap on the one you want.
First, there’s now an option of an LTE-capable model allowing for always-on connectivity. This is through the use of an eSIM inside and an antenna cleverly hidden behind the display. The great news is that your Apple Watch 3 will share the same phone number as your iPhone, whereas other LTE-capable smartwatches have required you to juggle two phone numbers. You’ll need to pay for an additional smartwatch plan for the functionality, however.
The Explorist and Venture cases are an average thickness for a round smartwatch (at 12.5 and 11.5 millimeters, respectively), with widths of 45 mm and 42 mm, respectively. Neither watch feels too heavy or awkward on a larger wrist, though even the smaller Venture watch is still quite chunky on a smaller wrist. Each model’s battery regularly lasted a whole day in our testing, and the voice-dictation functions are on a par with those of most smartwatches; the same goes for Google Assistant’s accuracy. Both watches and their Google Fit system track day-to-day activity, and although Wear OS apps don’t have quite the buy-in from app makers that the Apple Watch does, you can likely find your favorite apps in Google’s Play Store, and most phone apps provide rich notifications that you can interact with through the watch. Both show signs of good build quality, with thoughtful attention to detail on all surfaces and no cheap connectors or pieces.
"Sport watch" functionality often includes activity tracker features (also known as "fitness tracker") as seen in GPS watches made for training, diving, and outdoor sports. Functions may include training programs (such as intervals), lap times, speed display, GPS tracking unit, Route tracking, dive computer, heart rate monitor compatibility, Cadence sensor compatibility, and compatibility with sport transitions (as in triathlons). Other watches can cooperate with an app in a smartphone to carry out their functions. They are paired usually by Bluetooth with a smartphone. Some of these only work with a phone that runs the same mobile operating system; others use a unique watch OS, or otherwise are able to work with most smartphones. Paired, the watch may function as a remote to the phone. This allows the watch to display data such as calls, SMS messages, emails, calendar invites, and any data that may be made available by relevant phone apps. Some fitness tracker watches give users reports on the number of kilometers they walked, hours they slept, and so on.

All but the Martian Notifier claim some degree of water resistance: the LG, Samsung, and Motorola models can survive underwater up to 1 meter for 30 minutes, the Cookoo2 up to 100 meters, and the MetaWatch up to 3ATM, which is equivalent to 30 meters. Only the Martian and Motorola models claim to have scratch-resistant screens (the Martian has an anti-scratch acrylic crystal and the Moto 3 uses Gorilla Glass 3).
Dealing with notifications on a Wear OS watch has gotten better as the phone version of Android has improved its already impressive notification system and as phone app developers have taken advantage of new interactions. Many apps now send notifications with action options: For example, you can check a to-do as done, approve a payment, respond to a message, or, most often, just acknowledge something. The Q Explorist and Venture are no different than most Wear OS watches in relaying notifications, but in our testing they rarely showed lag in processing them, nor was either watch’s screen unresponsive to swiping or tapping options. Each watch’s vibration motor provides just enough buzz and movement to avoid missing things while not feeling like electric collar training for humans.
The new Diesel Full Guard 2.5 has a 47mmx56mm casing which is bigger than most Wear OS watches, and there’s a 1.39-inch display at the center of that. This new refresh of the watch also includes NFC for Google Pay support, a heart rate sensor, and built-in GPS. Diesel also says this watch will last two days on a charge from the 300mAh battery. The watch also has 3ATM water resistance.

For deeper integration with your Android phone, you can give Google's Wear OS platform a try with Fossil's $275 Q Control touchscreen smartwatch. It lacks GPS and support for NFC payments, which is why the Gear Sport is a better fitness-focused smartwatch for Android users, but Fossil's Google Assistant integration and stylish design make it a solid contender. However, smartwatches with Qualcomm's new Snapdragon Wear 3100 processor start shipping in October, so you may want to hold off until we put them to the test.
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