Alot of people would argue that Hitchcock absolutely was not the best director ever, and I would be one of them.
Start your list with Sidney Lumet and keep going... Hitchcock is no doubt in the top ten, but he ain’t at the top. Probably fifth or sixth, IMHO.
I may have overstated. Let me correct myself to say he was one of the best directors ever.
Stanley Kubrick is my # 1