floyd. I really like kell brook but i just think he has a style that suits floyd, he's also a slow paced fighter and likes to do things at his own pace but that style always suits floyd.
Mayweather by UD. Brook is a boxer puncher, he likes to wait and counter most of the time and isn't exactly good aggressively. If he's going to wait in the middle of the ring and attempt to outbox Mayweather then he's in for a clear beating. To beat Mayweather he needs to be in his face all night, constantly throwing and nonstop consistent aggression. Brook simply doesn't fight that way, it's not his natural style.