THanks for your answer on mine.
I like St Louis here, if yardage is a scoring (possibly negative scoring) factor, I would go with the team with the strongest secondary playing a team with a pretty weak run game. Arizona is 29th in total offense and 24th in passing, so Larry can be kept in check and while Roberts may make some grabs while being paid less attention to, they wont be throwing much period. Ryan Williams is pedestrian, and sucks in the pass blocking so they just put Powell in, which is kind of a tip off to defenses.
In the end, St Louis gives you a big upside without a whole lot of risk, id most definitely run them this week.