I am voting for Luke. He could prohably sense the Predator or its traps with The Force. He also has the advantage of superhuman reflexes, and the ablity to throw objects from the surrounding environment at the Predator. If the Predator tries to use any projectile based weapon, Luke could use the Force to throw it back at the Predator. I am not ragging on Predators, just my opinion on why Luke would win. It would on what version of Luke. If its Luke from Empire Strikes Back or Return of the The Jedi its more even. Luke would win much more decisively if its EU Luke Skywalker.