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Pro Accurate, real-time heart-tracking
Peak has an optical sensor with a brighter-than-most-competition LED and a good photoreceptor. A brighter LED helps avoid much more channel interference and a good photoreceptor can gather more data. It allows the device to take better measurements in motion.
Pro Accurate step counting
The step counting for the device is on par with other popular devices, so there are no worries of miscounting ones steps.
Pro Advanced sleep tracking
Peak can track light, deep and REM sleep, along with documenting "tossing and turning." This way the user can have an accurate reading of how they behaved when sleeping in order to judge if they are getting restful sleeps.
Con No synced notifications yet
Currently Peak does not support smartphone notifications, but that functionality is expected at the end of the year with a firmware update.