Hockey seems the obvious answer, but I would say they're about even. And the reason I'm going there is that hockey players definitely dive as well, and that a penalty gained by diving is far more serious in terms of influencing the outcome of the game than in soccer (unless it's a pk in soccer).

I have no idea why the NHL allows players to fight, but if soccer had the same policy soccer players would go for it as well. That doesn't make hockey tougher. Just more stupid.