Very few maybe peak Lewis or Bowe at his very best which was very short.The rest are too static and muscle bound the 66 ali would cut them to ribbons and bust them up.
The most modern half. I find no compelling reason that his protoges weren't actually better in s head to head sense. Holmes, Tucker, Dokes....
Insane hand and foot speed for a big heavyweight. Superb reflexes. Incredible willpower and an iron chin. There is pretty much no heavyweight that has ever lived that can beat a prime Ali (just before his lay off).
Lewis and probably bowe I say Stevie. But it's all a question of speed with Ali. Both guys are carrying so much more weight against a man who has the speed of a middle. Even if they nail ali he has the ATG chin. And can't see em out boxing him.