I prefer to teach on glow, 4 channels. Ail, elev, rudder, throttle. If you learn on 3, you have to re-learn everything on 4. Might as well learn it one time, then everything else is the same. If you go to a 3 channel later, it will be the same. Doesn't work going from 3 to 4 though. Not much different, but enough that people have trouble with it. Might as well do it right if your going to do it.