Normally, setting up with two servos, one on each aileron, would be more for the torque for large ailerons or for the resistance presented to the aileron by the slipstream. Strength is necessary in that case. Also, you can get the benefit of a bit more control in the trim for each side with two servos. After all, once you set up the ailerons with one servo, using torque arms, what you get is what you get.

With that said, though, I must somewhat agree with the above post in that what is important for a learner is to learn to fly. Ailerons will help, but with a properly set up plane with dihedral, you can get the sedate response necessary with a trainer with rudder only.

I learned on a plane that had ailerons and liked the way it flew. I also flew with one that did not have ailerons (rudder only) and it was equally easy to fly, but the aileron equipped plane was more responsive.

Your choice of if you want ailerons or not, or if you want to use two ailerons or not. But I think for that plane, you will not gain a thing with two aileron servos.

CGr.