Battle of the aggressive punchers

[Violent Bob]

All these heavyweights are either heavy handed or aggressive pressure fighters. But who is the best based on style and the impact it had?

I voted Foreman, though Tyson would be a legit response as well. With Foreman on the board, you couldn't possibly vote Frazier. Rocky always looked too sloppy to me to stand up to all-time-great heavies in their prime (Foreman, for instance).