I guess the question I would have to ask is; whats your budget?
I use the Prodigy, and recomend it, if thats what your budget will allow, if I could afford the Brakesmart, I would use that.
some of it also comes down to the trailer, and the wire used to get from controller to trailer brakes, too small of wire with too big of a load and you can crank any brake controller up full throttle and still keep on smoking down the hill (personal experience).