From best to worst I would go...

1. Tunney (even though he is a punk and a chicken for not fighting black fighters)
2. Dempsey
3. Baer
4. Schmeling
5. Walcott
6.
7.
8.
9.
10. Bradock

Braddock isn't in the class of those guys, he got lucky and was a club fighter at best.

Max Schmeling was the best human being of those guys, he was a true gentleman and hero.