Dude, I had this problem for weeks too...I finally had to trade Rivers in a package to acquire Wayne because I would never pick the right guy. Any time you post the question here you'll get 50% Schaub and 50% Rivers. Its an impossible battle I finally decided I wanted Schaub as my guy and got rid of Rivers...With that being said, I'll contribute to the Shaub vote here and give you my best advice to get an upgrade for your team for Rivers.
I hate to say this because I am a 49er fan, but I think Schaub is going to put up some good #s this week. He has some great weapons in AJ and the emergence of O. Daniels. Rivers is probably going to have a good game too, but you can't ignore Schaub's recent performance.