As you might already know, Hulk is one of my favorite superheroes... Therefore I believe the Hulk would win. However, I have legit reasoning, not just the fact that he's one of my favorites. First of all, the madder Hulk gets, the stronger he gets. Similarly to the Hulk, Red Hulk gets stronger the more radiation he is exposed to. However, once Red Hulk is exposed to too much radiation, he is forced to stop fighting, because his body begins to burn up. Therefore, if it is a longer fight, Hulk would win because Red Hulk has a limit, while Hulk does not (As of now in the world of comics)... However, if it was a short fight, Red Hulk would win. This is in my opinion.