Archer C7 V2 Difference between variants of 19.07.7

In the firmware selector there are three variants. Do these have to do with the wifi drivers? How do I determine which is best for my unit?ar71xx/generic),ath79/generic ,IL)

ar71xx and ath79 and different wifi driver packs.

ath79 will be the new standard from now on, so it might be a wiser choice.

IL probably means Israeli version of the device.