Gotta go with Williams.
Not too sure about his chin yet, though. He took a lot of Sharmba Mitchell artillery, but hey, it's Sharmba Mitchell.
But then again, nothing has really convinced me that he doesn't have a chin either.
And the height difference isn't that huge either, which usually is a huge Williams advantage. I think Tony is about 5'11" or so himself? But Williams should have something like a 10" reach advantage still.
His workrate is fantastic and I see him picking Margarito apart all night with combination reach and workrate.
Only downside still is a relatively untested chin and prone to taking a lot of shots too.
But I think he'll respect Tony's power to completely unload on him unguarded.
If he keeps distance, keeps up workrate, and picks Tony apart with shots down the middle, Windmill Margarito stands no chance, save for a Hail Mary shot. But that's basically Margarito's gameplan from round 1 too.
Williams UD over Margarito