Both fighters with shaky chins. Judah had extremely fast hands, good power, that sneaky left uppercut, but obviously not the toughest guy mentally in there, as he had issues with focus and being a front runner. Roger had a monster right hand and solid skills. I don't think he was quite as fluid and athletic as Judah. He had pretty good hand speed, but definitely not as fast as Zab. He took a better punch at 140 than he did at lower weight classes. I think Zab hurts Mayweather early, then Mayweather recovers and stops Zab in the mid rounds. On a side note, Mayweather-Brazier was a hell of a fight.
I'd go with Roger. Better skills, better ring IQ. He was more defensively responsible too. I think he KOs Judah in the mid rounds.
I'd actually go with Zab. I see all the problems that Zab gave Roger's nephew in the early rounds with his speed, and I picture Roger in place of Floyd eating those shots, and I have a hard time seeing Roger survive that kind of attack.
And I keep seeing the Tszyu right hand that landed and knocked Judah stupid. Roger was chinny as hell but he could hit like a truck. I lean toward Judah but it's a dangerous fight for both guys.