As I said, Ali has more mass than Lee, but Lee has way more speed. Having that extra speed counts as much towards how hard a blow hits than mass does, maybe even moreso. As others have said, Lee could kick a 300lb heavy bag into the ceiling while standing stationary. I bet Ali doesn't even come close to that. Which means that Lee's hits way harder, all due to his speed. Which is also why he could do a 1 inch punch. It can't be denied that Lee just had way more force behind his attacks. Some of the things he did scientists still don't understand.
Also, Ali has a lot of trouble even hitting Lee because of his speed. His incredible speed is both offensive as defensive.
I'm inclined to say that anyone who votes Ali just doesn't know enough about physics or Bruce Lee's achievements.