Your # 1 fantasy fight at any weight class

If you could pick two boxers to meet in their primes and see them go head to head who would it be and what do you think the outcome would be???? Mine is Ali vs Tyson...Iron prior to his jail stint and prior to the death of Cus vs Ali prior to his 4 year lay off due to his military court case. I think it would be a great battle much like the Ali vs Fraizer fights but Ali would have a little bit more foot speed and Tyson would have better head movement and power in both his left and right hands. In my mind it would be a 12 round affair with Ali out pointing Tyson. We might see a knock down or two but Tyosn might get frustrated after the first 7 or so and Ali would out calss him. Lefty