I am using a 9 CAPS for a year now. As I know the difference between them are super has 3 timers normal has 2. It has some difference in heli and glider menus.

If I were you I would buy the 10C. 2.4 Ghz is the newest technology so why buy an old one. Especially if you are planning to use it in a gas powered plane 2.4 receivers don't have any problems with the ignition.