They both are very good , buy everybody who keeps saying stats for RG3 isn't looking at the total picture.
Luck's Stats are just as good.
3500 yards 299 ypg 5td runs 17 passing tds
2600 yards 221 ypg 6td runs 17 passing tds.
RG3's passer rating is better because he plays in a different offense. Luck is asked to throw the ball deep down the field much more. Also, Luck has a 1-15 team at 8-4 right now.