Who are you going with...15 rounds under the cruiserweight limit of 200 pounds. I think Spinks edges him out with a SD win in what would have been a great CW fight.
At light heavyweight I might swing to Spinks but at cruiser I think Holyfield takes it. Spinks one of my favorites cause he was under privileged guy from St Louis getto but kept clean and worked at his craft and unlike his brother he developed into a great fighter. He had so much natural talent buoyed by all the work he put in at the gym. His era the light heavyweight division was loaded with talent and he beat them all. Also his achievement in becoming the first LH champ to win the heavy title was remarkable. The diet he was on with a nutritionist to bulk up was cutting edge at the time. Holyfield of course is similarly honorable. Worked very hard and as a heavyweight became an all time great certainly better then Spinks at that weight.