If you're a data nerd or an athlete with a casual interest in stats, the Vivosmart 3 is a solid choice. For $140, you get comprehensive metrics, lots of notification options, and good battery life. The downsides are a cloudy display, a lack of interchangeable bands, and a clunky interface.
Comprehensive fitness tracking, including heart rate; Good battery life; Safe for swimming; Comfortable
Cloudy screen; Hard to read in direct sunlight; Finicky interface; No GPS; No interchangeable bands