If it were me, I'd fly the 3 channel with rudder on the left stick if you can. Nothing wrong with learning to use your rudder more. I fly in pattern meets, am going to start flying IMAC next summer, and have even started to fly 'real' full scale planes. Rudder use is very important to keep your plane tracking straight at all times, through all maneuvers, and to keep the little bubble in the middle of the gage on the dash board (although I found it's easier to just fly by feel and not staring at the gages).

So I personally would LOVE to have a 3 channel plane in my quiver; I would use it for practice.