I am going with Hulk.
Why? because Nile tails Naruto would have ulimited Chakra (energy) but then again hulk would have his ability to heal as he get angre, there really isn't anything Nine tail Naruto can do to hulk, hulk can maybe hit nine tail Naruto but if Chakra is energy hulk would not be able to kill Naruto, but they again in 1 tail fox form Naruto heal and hurts himself, so imagine 9 talls. Naruto would lose because the Nine tails chakra would end up killing Naruto after a while. Because the Nine tails is in Naruto's body he too would die when Naruto Dies. If it was Nine tails vs Hulk then that would be a statemate because the nine tails wouldn't have a human hosts limits to using his recovery. Some people might say Nine tails has alot of power, but he doen't have any that can knock hulk out or put him on the scale of World Braker: people that can distory the world: as Pain's plan was to combine all the Tail demons to make an attack that can destory the world so he can recreate. where these character WWH at the end, Superman, Silver Surfer, Thor (comic) or Goku (nonsuper saiyan), any cast of Dragon ball can distory the world without even wasting much of their power if any. and Hulk has taken blows from most of these guys and didn't get knock out.