The top smartwatches that debuted at the 2017 Consumer Electronics Show included the Casio WSD-F20, Misfit Wearables Vapor and the Garmin Fenix 5 series. Apple released on September 22, 2017 their Apple Watch Series 3 model which offers built in LTE cellular connectivity allowing phone calls, messaging and data without relying on a nearby smartphone connection. 
Our 19 contenders all promised to give us some distance from our phones by notifying us of incoming calls and texts. But we found that some smart watches were much slower than others at letting us know we had a call. It turns out the quality of the bluetooth connection determines how quickly you’ll be notified, with our worst performers only registering the call with two seconds to spare before diverting to voicemail (yes you, Montblanc) while others simply failed to display any calls at all.
Samsung Gear S3 Frontier: Until we see what Google can pack into a smartwatch with its long-awaited Pixel Watch, the best smartwatch for Android users is the Samsung Gear S3 Frontier. It pretty much has everything a user with an Android phone needs in a smartwatch - GPS, heart rate monitor, water resistance, near field communications, an always-on digital display, messaging alerts and app support. I don’t see a real need to opt for the 3G version yet, which would untether you from your phone completely but adds around $100 to the price. ($549)
Despite that, it's a very competent Android Wear 2 watch. What's more interesting, however, is the concentration on fitness.While it features all of the necessary sensors to track running, cycling and swimming, our initial testing has revealed the Huawei Watch isn't the stellar performer we hoped it would be. Which is a shame, because emphasising the fitness element was exactly the right thing for Huawei to do, and hopefully the company can improve its fitness tracking software updates.
You can also use devices that support the Google Wear operating system in conjunction with an iPhone as well as a Samsung Gear device that runs Samsung’s own Tizen operating system. But Google Wear and Tizen devices are designed to pair with smartphones using the Android OS, so you won’t get full functionality when pairing with an iPhone. For instance, some Android smartwatches carry Samsung’s smartwatch line-up and naturally enough, work best with Samsung smartphones, but are still compatible with Android-powered Huawei or Nokia phones.
While you're not getting Spotify or Apple Music here, you are getting enough storage for 500 songs with a process that's fairly easy. You just boot up Garmin Express, select the Music tab and choose which of your own music you want to port over. If you do want to sync over playlists from a streaming service, your only options are iHeartRadio and Deezer.
If you don’t need your smartwatch to look business-casual, you want more fitness and exercise features than our top pick, or you’re a Samsung loyalist, the Samsung Gear Sport is a better pick for you. (You can use the Gear Sport with non-Samsung phones, but doing so requires that you install at least four apps.) The Gear Sport handles all the casual notification and message-triage functions of a smartwatch about as well as our top pick—with the exception of voice transcription—but it adds heart-rate monitoring, GPS tracking, swim tracking, and built-in reminders to move throughout the day. It doesn’t do all of these things perfectly, but it does just enough to make for a generally useful smartwatch, with great battery life and a clever interface.
The Misfit Vapor was originally launched with a proprietary operating system, but that was ditched for Android Wear 2.0. The Vapor has a 1.39-inch AMOLED display, Snapdragon Wear 2100 processor, 4GB of storage, 512mb of RAM, and a heart rate sensor. Those specs are fairly standard for Android Wear, but the Vapor also includes 5ATM water resistance which is a huge plus, and an assortment of software features added by Misfit.
If you want the app, notification, and style advantages of an Apple Watch but need better fitness tracking, you can upgrade to the Apple Watch Series 3 and get built-in GPS, as well as waterproofing that allows swim tracking. But the Series 3 costs more than a fitness tracker or even many running watches, and it still has compromises compared with a dedicated fitness tracker, such as a lack of dedicated physical buttons. We think serious athletes are better served by a fitness-specific device.
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