Battery
Here is where the FitBit Versa really shines. With a battery that can last up to 4 days, it requires much less frequent charging than the Apple Watch. This means it’s more practical to use the FitBit Versa as a sleep monitor and alarm clock (which will gently buzz on your wrist to help you wake up in the morning) since you won’t need to charge it overnight. Streaming music, however, significantly reduces battery life.
The Apple Watch struggles by comparison, especially if you are using battery-intensive features like LTE and GPS. If you’re just tracking a workout, mirroring notifications or responding to texts, you’ll get about a full day’s use before you have to charge it — anything extra is a bonus.
Both use proprietary chargers but they do juice up fairly quickly.