Michael Myers is unable to die. He is inflicted with the curse of the thorn.
Jason Cant die because he is undead.
Leatherface is mortal....strong and scary ..but mortal.
between Jason and Michael, Micheal Myers wins. He isnt just powerful physically but he is Cleaver... unlike Jason. Michael would let Jason swing around like a slow gorilla but thats it. Micheal is like a Mack truck that never needs gas or a tune up. he's like a a huge chunk of Oak with a brain. michael would win this fight.
as for freddy, he is in the same class as Pinhead. they fight eachother.