Well done to landmine950 for taking the time and effort to compile such a list to attempt to make a comparison!!!!
However my analysis will be founded on a much less acute system...my own opinion.

This question is intriguing as we are speaking of two virtual opposites:
Marciano a compact(avoiding the words small or undersized) immenesly powerful fighter of perpetual motion.
And Valuev the enormous (again avoiding alternate wording!) strong but slow and deliberate fighter.

As Marciano is a bonafide legend and Valuev is still something of an entertaining oddity let us just consider 2of eachs most noted wins. Joe Walcott Ezzard Charles VS Monte Barrett Jameel McCline

Sorry no point continuing a KO win for Rocky