RGIII is a much better QB than vick coming out of college. He is also more mature and will actually watch tape.
Vick os the most agile QB I've ever seen. RG3 ain't that. Maybe top end speed but ranging direction and agility Vick has him beat. It's as if Vick used to never lose speed while changing direction and that's what made him amazing to watch.
RG3 is a much more polished passer though coming out of college. His military background from his dad will help him with his maturity and discipline coming into the league and is also the main reason, aside from his ability, why I think he will succeed in the NFL.