well this is really no contest
Mr. X is slow as hell unless you are talking about his last form at the end of the "B" games
and even then what do you kill Mr. X with.....A Rocket Launcher
what does Nemesis have....A Rocket Launcher
but if he didnt have the rocket launcher I think the final Mr. X form would win because he would just run past nemesis right hand since he is left handed
Mr. X is slow as hell unless you are talking about his last form at the end of the "B" games
and even then what do you kill Mr. X with.....A Rocket Launcher
what does Nemesis have....A Rocket Launcher
but if he didnt have the rocket launcher I think the final Mr. X form would win because he would just run past nemesis right hand since he is left handed