After watching RGIII play last night, my opinion of him is that from a physical standpoint, he is definitely a superior athlete- he can throw it harder and he can run faster (he can really explode to the edges off the zone reads). However, from a mental standpoint, I think RW is ahead of him...by a lot. It's clear to me that he is not running nearly as sophisticated an offense as RW. Firstly, everything is based off the zone-read option formation which he used in college, which gives him an extra second to make his reads, so kudos to his coaching staff for implementing it. However, it seems that there is only 1 read when he actually passes the ball. One play that I saw him repeatedly throw was an inside slant route by the WR on a play action where all he needed to do was read the inside LB and whether he bit or not. He must have thrown it for a completion 3 or 4 times last night. When his read isn't open, he just checks it down to his back. This is another big difference between him and RW- RW breaks contain and continues to try and throw it DOWN the field rather than checking it down. The only time I see RW checking down is when he's about to get sacked. The net result is the chance for more explosive pass plays for chunk yards.
No doubt there is great potential for RGIII to be an elite QB, but I'm not sure if he'll ever be the cerebral type, ie. Manning bros, Brees, Brady, etc. On the other hand, I can definitely see RW becoming that type of QB. And that could be the difference between just making the playoffs and winning a SB.