Ali hands down has the best resume. He beat Liston x2, Patterson x2 (well, OK, once was legit), Cooper, Williams, Folley, Norton x2 (highly-disputed), Frazier x2, Foreman, Lyle, Shavers, Quarry x2, etc. How can you trounce that?

Holyfield beat Qawi, Douglas, Tyson x2, Bowe, Moorer, Ruiz, Cooper, not too shabby.

Holmes beat Shavers x2, Cooney, Bonecrusher, Truth, Weaver, Witherspoon (?), Mercer, and made 20 title defenses successfully. How can you beat that?