I'm taking Norris. Floyd is great and has a better defense. I personally feel the Norris has a lot more guts than Mayweather though. Also, he had an iron chin and would not go down without a good fight.

Mayweather in a UD, I think Norris was an excellent fighter, and his tremendous shape would go a long way against Floyd, but I think Mayweather has to much speed and defense for Norris to really attack Mayweather. Plus Norris really struggled against other orthodox fighters, being knocked down or out many times (not saying that Floyd would do that), so Mayweather in a UD 116-112.

Floyd Mayweather Jr. 10Rd TKO

If they fought 10 times. Mayweather would win atleast 9 of them. Mayweather was smarter, faster, stronger, better.