Don't feel bad. We've seen enough "Ali vs. Marciano" threads or threads about Mike Tyson's biceps to last us many lifetimes. This is a welcome change from that banality.
It all depends on where it's held. In Zaire, I'll take Toledo Dempsey. In Manilla, probably have to stick with Kingston Foreman. In Las Vegas, it has to be MSG Duran, but in MSG I'd go with Youngstown Mancini.