Only Hitecs are programmable in sizes of servos we use. Generally, Hitec digitals have not had as good resolution, deadband, and centering as JR/Futaba. Hitec's had about 4 usecs of deadband, and JRs/Futabas about 1 or less. That is with the Hitecs programmed to the least amount of deadband. There are second generation Hitecs coming out, and I don't know about them, but they are just as expensive as JRs and Futabas. For pattern, the programming has little value. I haven't used Airtronics, so I can't talk about them.

I use JR. DS9411sa's for aileron, DS3421sa's if I use split elevators, and DS8417 if I use a single servo, and a DS8611a on rudder. The DS8411sa has enough torque for rudder, but I've had issues with them oscillating around neutral on rudder. Never had an issue with a 8611a.