I have never had a plane in which I have changed servos from what was originally installed. I have flown two planes of the same model and make with different servos and to me they flew the same. The difference was the engine Brison vs ZDZ and the other was digitals versus coreless Futaba's at 6 volts.

I could not tell how one responded better than the other. Now, with that said, I can tell the difference between 9202's on 4.8volts versus 6.0volts!