I'd say Ultra 1/2. It has a bigger battery and will last about 3 days if you don't do anything. I charge it during shower and that will give you enough battery to monitor heart rate 24/7(If that's what you are looking for). But then, other non-apple fit band should have longer battery life than Ultra
I'd say Ultra 1/2. It has a bigger battery and will last about 3 days if you don't do anything. I charge it during shower and that will give you enough battery to monitor heart rate 24/7(If that's what you are looking for). But then, other non-apple fit band should have longer battery life than Ultra