RG3 all the way. Makes plays in the clutch, look at the last two weeks against Kansas and Oklahoma. Generally makes good decisions under pressure. He can throw on the run and always keeps his eyes down field. Can make plays with his feet alone. His mobility would help the oline situation much like Vick does in Philly and is a much better pocket passer than Vick was coming out of college. Accurate passer with good mechanics though the ball does seem to wobble a bit too frequently, but that is okay when it is consistently on the numbers/over the shoulder. My biggest concerns for him are he doesn't seem to always read the defense over the middle well. also he doesn't work from under the center but since all his other mechanics are good I'[m sure he can figure that one out. Look at his game against Oklahoma here
Robert Griffin III vs Oklahoma 2011 - YouTube
I am not sold on Barkley one bit. His play against Oregon was spotty. A few great throws yes but two dropped snaps and one where he tried to throw after picking it up and pretty much hit an Oregon player in the numbers, luckily it was dropped. Looked alot like a bad Romo and Grossman game. He can see all his throws here
Matt Barkley vs Oregon 2011 - YouTube
judge for yourself.