Which Telemetry should i use?

PX4 Autopilot
1

I plan to use pixhawk with XBee Pro Telemetry module. But i can not decide which telemetry should i use actually. Also which frequency should i use ?

I have three options. 450 MHz, 980 MHz and 2.4 Ghz. which frequency is the best for telemetry module ? by the way my mission with UAV is using image process.