Both are very similar; Small in stature, but super-athletic. I actually think that Wilson is a much better passer than RG3 but Griffin III has speed that's 2nd to none. RG3 is charismatic, a true leader, and will die for his team. How about the 8 yard run where he was limping to the sidelines. That's heart!
That said, I would have to see more of Wilson but he's explosive out of the pocket. His size doesn't affect him like Doug Flutie.
I love RG3 but Wilson is thicker (less frail), I'd take Russell Wilson. He was a 3rd round gem out of Wisky. He won the Big-Ten title as a transfer. The guy is awesome.