Standard League MNF QB Who Would You Start?

I’m currently in a standard league along with YouTube friends, and I currently have three quarterbacks because I dropped Jordan Matthews since he was questionable WK1. My first QB is Jameis Winston, but he was of course, left out since he had a BYE WK.
Do I start Sam Bradford versus NO or Philip Rivers at DEN?
I have a gut feeling that Rivers will do great WK1 because he has essentially his entire offense back, but Bradford is going against the worst defense on the league, but it doesn’t erase the fact that he’s Sam Bradford.