(This is going off of the movies, never read the comics, or the Harry Potter books, but my sister can quote the books almost word for word, so...)Definitely Wolverine... I mean come on, does anyone remember how he killed The Phoenix, the only Class Five mutant known... She was trying to make him disintegrate, but his regeneration capabilities are astoundingly limitless, so that his skin grew back almost instantaneously. Also, he was shot in his Frontal Lobe by an Ademanteum bullet, which controls emotions, memories, vital body functions, instincts, senses, and much much more ... and yet he still lived, his mutation causes his body to heal itself no matter what. So no matter how many spells Professor Snape throws at him, and no matter how many times he uses the Death Curse, Wolverine's mutation will kick in, and his body will regenerate, causing the spell to be ineffective, and, on the unlikely chance that the Death Curse could actually kill him, his regeneration powers would bring him back to life. All in all, Wolverine is a ***** bad ass, and nothing/nobody can beat him!!!
WOLVERINE WOULD WIN; NO MATTER WHAT!!!!!!!!