Probably do a search before starting threads as this has been covered many a time.
Saints have the most power, if thats what your looking for. But i find that they have a weird jar sort of feeling when you start to pull them in which i did not like.
I have Codes. I love them, no drama's at all they have all the power you need with no jar feelings. You can get straightline levers for these so their better
.
I haven't actually felt the Formula's, but have heard they are the best brakes for downhill.
Hope this helps.
Tom.