I don't think either one is a "bad" start, but until he has a bad game, I think Matt Ryan is a must start in every format. I like RG3 (a lot), but he's still a rookie, and a bumpy game is almost certain to happen.
As a side thought, have you thought about shopping one of them? You should get a nice return.... and unless its a 2 QB league, you don't need em both.