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IMO, Superman wins - Hulk only has one power, Superman has loads of versatile powers - flight, super speed, heat vision, freeze breath (does he still have that?), probably loads of other goofy ones that he used once in the 70s or something and then the writers forgot about...
OK so the Hulk is capable of exceeding Superman in strength (Supes is probably stronger to start with, but his strength stays constant, whereas Hulk gets stronger the longer he fights for, and will probably quickly exceed S-man in raw strength), but Clkark could just pick him up, fly into space, and throw him out of Earth's orbit at escape velocity or something... Hulk can't fly, so he can't get back...
That's if Superman is fighting sensibly (ie, dirty) and not like his usual do-gooder self, of course (do-gooder Supes would probably try to calm Hulk down until he turns back into Banner, or some such tactic)...