the 7c does not offer the same software mixing ability as the 9c. the 9c is a superior radio. with the 9c you can have dual channel elevators that respond to the trim control and dual rate ail rudder and elevator. the 9c is the least expensive version of a computer radio that is the most versatile and should suit the most needs. the better much more expensive are the 9z and 14 which are very expensive compared to a 9c. sorry about not mentioning jr but I do not know the models too well. The 9c has a selectable transmitter that allows pcm transmission of ppm transmission. For pcm you need a futaba pcm receiver in the plane. For ppm you need a ppm receiver in the plane with the proper shift for that radio I think it might be a negative shift for futaba but you can use hitec receivers or futaba receivers.