The Superfoot, without a doubt.
Norris was great, no doubt, but capitalized on the fact that the majority of fighters at the time were Japanese stylists, and had never seen some of the things he was doing.
Lewis was a greasy fast bear, but would basically stuff guys in a corner and brawl.
The Jet had crazy heart, and would fight anybody, anywhere, any time.
But Wallace, the man was simply incapable of being defeated. He'd tell you where he was going to kick you, and do it, and you would not stop it.
The man ate Wendy's, and then immediately went in and won a championship fight.
And his mitts are enormous.