I presume your talking about Michael Spinks? Thats a good fight. Michael really could box well like he did against Muhammad. That plus Evander only being much smaller could result in him winning a UD. But then again sometimes he showed a warriors mentality and tried to slug it out. Then I would give it to Evander on a late ko. Interesting fight though, Spinks had a herky jerky style.
I'll go with Spinks. I'm assuming that the fight is at cruiserweight, where Spinks never fought, but he was able to move up to heavyweight and win the true title there, and also beat the huge, although inactive, Cooney. Spinks should be able to handle the move to CW alright. Spinks was very versatile, boxing or bombing guys out. Against Holyfield I think he'll go into his ugly, awkward herky-jerky style with his consistent jab which disrupted rhythm very well, exchange when he needed to, and win a decision.
They're only within a half inch of each other in height and at heavyweight Holyfield was a good 10-15 pounds heavier with a way more impressive physique. Holyfield was actually the bigger man. As for the topic of the thread I got Holyfield by Late KO/TKO. Spinks couldn't handle the pressure Holyfield would bring.
