Need fitness band max 3K budget.. with heart rate monitor.. for 50-55 aged man. found mi band 2 and saw mi band 3 rumor. Mentioned MI because of low cost fitness trackers. Going to buy new mobile in 2 months (maybe or will be redmi note 5), compared to mobile what will be good suggestion for fitness band/tracker? Also I found many fitness apps too, from different mobile companies also some 3rd party..? which will be good?? and cross compatibility will be there?? moto band with asus or any other fitness app..