Mark hunt by a long shot, anyone with a chin/hands and a intelligent game-plan can beat Roy. Frank Mir/JDS/Werdum all showed this (and one of them doesn't have the best of chins 0.o) Mark hunt strings together his combinations in such slick fashion by the time your tagged with his jab a blink of a second later your eating a full on overhand or uppercut. And his follow up strikes usually land because he works his jab really well in the first round (then he uses his head for defense after round 1 lol) Watch the Kongo/Hunt fight again and see how he finds his range with that jab, it even allows him to land a counter punch timing Kongo on the way in before the inevitable KO.
Mark hunt by TKO (definitely wont get a 1 punch ko but a flurry for a Tko maybe.)