There is a YouTube channel called 'The Quantified Scientist' that scientifically ranks smart watches on various metrics - https://m.youtube.com/c/TheQuantifiedS

There is a YouTube channel called 'The Quantified Scientist' that scientifically ranks smart watches on various metrics - https://m.youtube.com/c/TheQuantifiedScientist https://m.youtube.com/c/TheQuantifiedScientist It was incredibly useful for me when I was in the market for a smart watch. TL;DR if you want to track sleep, get an Apple Watch. Or if you are in the Android ecosystem go for one of the entry level Fitbits as they have pretty good tracking for their cost.