It's going to be a shoot-out, and I think both will have good days. Very tough call. I'm going with Warner, because a) I recently traded for him and this is the first time he's starting for my team, and b) it's at Arizona, so hopefully he feels like going the extra mile and winning at home.
I wouldn't be surprised to see both of them have 300+ yard days with a few TDs, so start either with confidence.
Help on mine? viewtopic.php?f=19&t=452736