Disagree. We're talking about both in their prime. Mike Tyson in his prime was singularly focused. He would have used Ali's insults as fuel. And people seem to be willfully ignoring that Tyson was exactly the kind of fighter that gave Ali trouble. Tyson was Joe Frazier, but better.
Ali and Tyson were both great in their primes. You say people are understating Ali's greatness while you understate Tyson's greatness. Ali was not known as a power puncher. Tyson was. So if there was a knockout, it would most likely be Tyson knocking out Ali. Tyson showed he could go the distance, but no one could go the distance and absorb punishment quite like Ali. So going to the scorecards probably favors Ali, but it's always a toss-up if it gets to that point.
I understand the hero worship many have for Ali. He may have been the most cerebral fighter of all time. But prime Tyson was everything that gave Ali fits in the ring. And in his prime, Tyson was pretty good at the cerebral game as well. Not on Ali's level, but not the dummy some want to portray.