I could imagine either winning, though have Tyson. COnsidering Douglas is even less relevant that the 2 times Lewis was KTFO. His training & motivation was abysmal, & he still nearly pulled it off. Tyson against Douglas was still amongst the best in the world, at least a top contender, but a shadow of hid old self, that also tells us nothing. Might as well compare Lewis at the same age as peak Tyson, just as unfair, since it was not the Lewis peak. Tyson seems to have been rumored to have been beaten like a rented mule by everyone & their Grandmother in sparring. I am skeptical.