So for me 4.7.5 because it is adding better manastone socketing when a fail doesent mean that every stone is removed some pve content like 2 new maps with 1 new siege and new pvp dungeons and of course invasion
The rest stay the same so it's still like 4.6 just a bit better with a bit more content
Everything from 4.8 on killed the game
So 4.7.5 is the best patch in my opinion it's just like 4.6 just a little improved
Everything above is trash