I think Marciano resembles Joe Frazier. A little less speed, equal power, and at least if not better chin. Granted, his comp. might not have been as good, and Ali would beat him 6 of 10 for sure, maybe more, but You can't discredit Marciano like he was a bum. He would have given Frazier fits, and beat him a few. And we know what Frazier did to Ali.

Ali is better IMO, but to say Marciano was not in the same breath, is a strong statement.