Fitbit Air on Biceps + Bevel (Best combo for this device's success)
I've been using my Fitbit Air with a bicep band and tracking my health metrics on Bevel. It has been a better user experience, especially with stress tracking and the energy bank.
The Fitbit Air on my bicep is showing better accuracy during my strength training workouts, better heart rate graphs and realistic calorie burn. For example: on my leg day I burned around 308 calories when using it on my biceps compared to 385 calories when on my wrist.