They both struggled with some heavyweights that were reminiscent of each other.
But Ali never fought anyone quite like Tyson. Frazier was similar, but one-armed, slow, smaller, softer, and infinitely less skilled. But Ali was also shot by this point, I don't think Frazier could win more then 2-3 rounds off Cassius Clay.
I don't think it likely either stops each other, I think it'd be different each time they fight, one guy stealing rounds here and there with the natural flow. But i favor Tyson to get a little more work done.
Jones competition was pretty suspect. For whatever reason, he never fought Darius M. In his prime, I think he could have an easy fight with most of the great fighters... but he doesn't rank all that high.