Floyd Mayweather is a far better fighter than Rock, and has much better accomplishments That being said, Moore is better than Berto, by far
Archie Moore was a thirty nine year old light heavyweight fighting at heavyweight with a thirty two year old power puncher. It's the opposite with Mayweather being 39 and Berto being 32.
A light heavyweight that weighed more than Marciano who had a shot back and horrible pain. Still got a KO.
Floyd has plenty of impressive achievements and opponents over his career, he hasn't only fought Berto I hope you're aware. This thread's like asking is water wet, what's the point...