Marciano by KO, Liston would not stand up to the test of Rocky's will, heart and determination, yes Liston fought once with a Broken Jaw, but I've known 2 guys that did that personally, both said after 1 round, the pain seemed to go away, it was just numb, so I'm sure that's what happened to sonny, great fighter, great reach, great power and solid speed for his size, but he can't match everything Rocky had, I have to go on what I saw them accomplish in the ring and what I have read on both from many sides and people, you have to pick Marciano by KO or TKO at the least a UD, no way Liston gets this win, again these dream fights have to be decided on the available information, video, what both say, what you can find out their opponents said, what common opponents said and wrote, what was written and known about both, then you compare all that and make a choice, Maricano all the way.