Floyd wins an about 8 to 4 UD, with maybe the judges making it 10-2. Against 160 Brook Floyd would have massive problems, but still edge it I think.
Great fight, but Mayweather is the master boxer here. Brook would have his moments though, but Floyd cruises to a UD!
Brook is bigger, stronger than Floyd, but he's a poor man's version of Floyd. I think it'd be alot closer, like 7-5 for Floyd in a very competitive fight. Brook's combinations are short, compact, but very crisp and precise. He'd weather Spence and Thurman's offense early too and then break them down the 2nd half with those combos and constant clinching. I'd favor Brook against anyone south of 147, with the exception of Crawford, who's been looking like the American version of Duran lately.