Hi guys i heard lot about these both radios Flysky fs-th9x or avionic rcb os-10,
But i am little bit confused which one to buy because flysky has flexibility to add modules like jxt where as avionic has telemetry as extra feature in it but cannot use any modules upon that the design is not that good mainly antenna.

My vote goe's to FlySky FS-TH9X................

9x is a bit like more expandable and time tested .uses atmega 2560 so you can modify it a lot according to you. And telemetry is also possible .
Os10 is new  but also open source. But less people to help.

+1 for 9x