BHop has longevity and consistency on his side. But let's be clear, he was never considered the best fighter in the sport at any point in his career. The most interesting thing about him now is that he is still relevant at half a century.
Floyd was in the discussion as the best pound for pound fighter in the sport for most of his career. Even if he gets knocked out tomorrow that doesn't change that.
It's all subjective. IMO Larry Holmes was one of the greatest heavyweights ever. I feel that way about Lennox Lewis as well. But I still haven't seen anything like Mike Tyson in the late 80's.