Well it all depends on what point in which series they are fighting. Say in the first Friday the 13th, 'Jason' (as in the person killing campers) would have had to sleep, and thus Freddy would have an advantage. same with when Halloween started out. Michel Myers was just a big scary guy with no supernatural, or undead qualities, so again Freddy would have the win. Also when Michel is in that coma for 10 years, he's fucked vs Freddy.
Once you get farther into each series Michael and Jason become unstoppable undead/demon/genetically altered (H6) beings that are unstoppable and probably don't sleep they would be fine I suppose.
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