Wow, great find. That's some really nice animation, though I'm really impressed by the models themselves. Especially Superman, someone did an awesome job of modeling Christopher Reeve's head. The Hulk model looks a lot like the CGI model from the 2008 film.
As to the fight itself, it's hard to say. I thought at first Superman would win, but I'm not sure. His powers are fed by the sun. So, as long as it's sunny, he can continue to fight and his powers will continue to recharge, though not as quickly as he'll use them, so they'll eventually get depleted. All Hulk has to do is stay mad and his powers will be replenished. Though, I'm sure he has his limits as well. (I'm not as familiar with Hulk's powers) It would definitely be a titanic fight, though. Both are incredibly strong and virtually indestructible. Though, Superman has a wider range of powers, that could tip the scales in his favor.
