Either the 10X or the 9303 will work fine for you, as will the Futaba 9C.

The 9303 has a few features the 10X does not have, like the flap elevator timing system to slow the elevator down when you mix it with the flaps. You can slow the ailerons down as well with the crow function as well. The channel mate on the 9303 is a great feature and comes in handy. With the 10X you can position channels just about anywhere on any switch (not as good as Futaba but still very nice). Futaba has the switch assignability down, no doubt about that. The 9303 can give you dual rates and different expo abilities in different flight modses, whereas the 10X gives you one rate and expo per flight mode. Keep in mind the 10X is 8 years old and the 9303 is only a year and a half young.

Buddy boxing from one to the other is simple, but they will only transfer between themselves, the 9303 and 10X will not comunicate with each other.

Whatever you get or have, get it in the air and lets go fly some jets. That is what it is all about.