If anyone could really best the Hulk, it'd be Batman. But, Batman is only human so he may have the brain, but the Hulk has the braun to bash that brain in. Yeah, Superman may prove to be a tough opponent, but again, the Hulk's power is limitless and it grows with his anger. Superman relies on the sun and is vulnerable to kryptonite. I'm sure Tony Stark would figure that one out fairly quickly. So I'd say Marvel would take it.