I don't think we ever saw the best of Tyson, his list of opponents never allowed him to show how good he could have been because he was in a time when his division was riddled with bums and chumps.

Ali is the most well known boxer of all time (except maybe Stallone ) he fought everyone and his time was saturated with great fighters, he fought them all and beat them all.

I like Tyson, he was great for clearing out his division, but then when he was still young, with no 3 year enforced lay off, he got crushed and made to look like a bum by a journeyman in Buster Douglas.

Never happened to Ali until he was ancient, fat, and suffering from Parkinsons disease.

No one can touch Ali's legacy.