This is a tough one for me. Not taking into account the people they fought, and just looking at their athletic ability, then I would go for Roy. Boxing skills and slickness, tough one, but again Roy in his prime was untouchable, best display of this was against Toney. The amount of opponents he goaded by placing his hands behind his back and countering was more than I've ever seen.

May get stick for this but im going to pick Roy as the greater 'fighter' of the two.