IMO this is one of the greatest match ups of all time. They both had a similar style, and both were relentless. IMO this fight would just come down to who had the better stats. Marciano had power, strength, stamina, determination and will to win, chin, and variety of punches to knock you out with. Frazier had speed, defence, weight, and accuracy on Marciano. IMO their heart is even. IMO Marciano and Frazier would just pound each other but Marciano's power and heavier blosws would just get to Frazier, and also, you can never rule out Marciano's "Suzie Q" that could knock any person out with just one shot.