Stafford, no question. I know he is injury prone but IMO you can't draft based on "what if he gets hurt". I draft on talent projected for the full season and if he goes all 16 games, he will out-stat Brady and Brees.
Newton is heading into the infamous "Sophomore Slump" where teams have had time to study him and can adjust. You could see this trending by the end of last season even where his numbers starting slipping. I predict mediocre stats from him this season.
Either way, best of luck to you and have a great season.