I've taught many folks to fly. Learn to fly the way you intend to fly. In other words if you want to have ailerons, rudder, elevators, and throttle. Then get a 4 channel trainer and learn to fly only once.
its not easier to start with 2 channels then move to 4.
One of my hardest students was a glider pilot, no throttle or ailerons. He had to relearn with the other 2 channels.
but if you only want 2 for what ever reason the rudder elevators