Why we like it: Garmin’s Vívosport fitness band gives you more (and more-accurate) fitness tracking features than a smartwatch, though you won’t be able to respond to messages and notifications or use apps on your wrist. The Vívosport lasts up to a week on a single battery charge, while an Apple Watch or Android Wear device requires overnight charging. Its screen always shows stats during a workout, while smartwatches like the Apple Watch typically turn off when you’re not looking at them. And you can wear a Vívosport while you sleep to get at least a rough view of how restful your night was without having to worry about charging it every morning. All these things give you a better overall picture of how active and healthy you are, and make it more convenient to wear one smaller device all the time: You won’t have to grab a phone to track a run, you won’t have to wear a large, utilitarian-looking GPS watch to work, and you’ll rarely have to worry about battery life during a long workout. The Vívosport also tracks heart rates and GPS location nearly as well as a GPS watch (with some exceptions), but in a smaller and less noticeable package.
Bottom line: If health and fitness tracking is your priority, opt for a dedicated fitness tracker that gives you basic time and date information but includes the essentials of health tracking - accelerometer and altimeter, heart rate monitor and GPS chip to track distance and location. Carefully consider your exercise habits to match them to the right fitness tracker.
For a device that gives you more of the functionality you enjoy with your smartphone, you’ll want to opt for a dedicated smartwatch. The leading players at the moment are the Apple Watch for iPhone users and the Samsung Gear S3 for those with Android phones. Apple Watch has its own operating system, Samsung employs its Tizen OS, and a host of other smartwatches use the Google Wear operating system.
The MetaWatch M1, like the Cookoo 2 and Martian Notifier, is a basic smartwatch. It shows alerts for texts, e-mails, social media updates, calendar appointments, weather, and Caller ID, and can control your phone's music app. The notifications are configurable in terms of what you are alerted to and how: whether via a vibration or on the watch’s display. Also built in are a timer, a stopwatch, and an alarm

Our top pick for most people is the Apple Watch Series 4 with GPS (starting at $399), which has a huge display, ultra-fast processor, Raise to Speak Siri, fall detection and a built-in electrical heart rate sensor for taking on-the-go electrocardiograms. It also runs watchOS 5, which makes the watch even more useful with automatic workout-tracking, offline podcast playback and a Walkie-Talkie voice chat feature.
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