Both are great boxers in my opinion but Sonny been the greatest of both, if you'd ask me this easy question, definitely would choose non other than the great boxer himself Sonny Liston, not because of anything, Though Wolcott was a a really good fighter and was tricky and at times awkward, but I think Sonny would eventually get to him and by today's standard he's probably a cruiserweight. Liston would have been too big and strong.