My favourite features are:
a) the design and the fit
b) the adjustable straps
c) the rib band, which fits me well without chafing or suffocating me.
However, the moulded cups aren’t that great that I end up with the “uni-boob” situation, which can be quite unflattering and uncomfortable 😛
Other brands like Anita Maximum/Extreme Control, Freya Active and Wacoal had high votes on Amazon