Help understanding Daikin ATX and FTX Split system range

[asmaircon]

Hi id like to know can anyone tell me the difference between the Daikin Inverter ATX wall split range and the FTX range, i know the ambients are lower on cooling with the FTX and also the FTX cost alot more, as the ATX is around £385 +VAT for 3.5kw and the FTX around £550.

Any differences in performance or quality?

Thanks