I use AFHDS2A in all my bots: FS-i6 & FS-i6X transmitters; 0.9g 4 channel receivers from banggood - they have been great so far!

https://www.banggood.com/Flysky-FS2A...r_warehouse=CN

They can be powered from 3.3-10V which is very handy (2s). Also a bind button rather than having to use a bind plug.

The only reason I use AFHDS (2A) stuff is because I got my first transmitter and receiver as a prize with a quadcopter, so there was no point getting different stuff if it worked fine.