Lets stick to pre tarver 2 roy.

The thing is floyds style will always last longer.

Roy never had defense. His speed and confidence was his defense which made an invisible chin.

After the muscle loss and tarver loss, the confidence went and so did roys physical ability and defense.

Floyd on the other hand, might loose a few rounds in a fight might take a massive shot but he will always have his defense to fall back on as its part of him overall.

Floyd has a reserve.
Thats what makes longevity..
Thats what makes floyd BETTER

But does it make him more dominant?

It must do.