To be honest, I hate Holyfield. Holyfield is nothing but a dirty cheater who do anything to get to the top. Holyfield took steroids, fought dirty in the ring, and possibly also bribing the judges.
Holyfield (1992 -1996) wins by TKO in late rounds
Holyfield by UD or late TKO's
The Klitschko's would of gave him tough fights though, especially Vitali. I just leans toward Holyfield, because he fought much tougher competition. Your average fan, couldn't tell you one thing about anyone the Klitscko's ever fought, except Vitali's loss to Lewis. Holyfield fought Bowe 3x, Tyson 2x, and Lewis 2x, just to name a few.
A prime Holyfield would destroy anyone in today's heavyweight division. I think anyone who's been watching boxing over the past 20 years would agree with this.
If Holyfield took steroids and headbutted all 12 rounds [like he usually did] he may survive and loose via decision.
Matt is right. Give him 10, lol...