GSP would win i think.
Probably the best pound for pound fighter in the world.
I don't like his style though, all he does is take down his opponent and stay on them for the whole fight.
They can't do anything about it though because his takedowns are so good and amazingly fast.
A better comparison would be Haye v Fedor - both heavyweights.
Fedor would destroy Haye even in a boxing match.
Probably the best pound for pound fighter in the world.
I don't like his style though, all he does is take down his opponent and stay on them for the whole fight.
They can't do anything about it though because his takedowns are so good and amazingly fast.
A better comparison would be Haye v Fedor - both heavyweights.
Fedor would destroy Haye even in a boxing match.