I used both the Apple Watch and Fitbit Surge and Charge HR. Both of the Fitbit devices are what I use when running and do a great job of tracking your sleep and HR. It amazes me how good the HR sensors work on both Fitbit devices as I can wear them so loose that the go over my wrist bone and onto the lower part of my hand and the HR sensor never misses a lick. They will give you your "true" resting HR. I was shocked as I have seen as slow as 58-59 often.