Alex Smith or Matthew Stafford?

This is my dilemma and I need help deciding, I have Smith and Stafford for my QBs, now I'm told Stafford is suppose to do good against the Saints, but I have my doubts, specially after how the Saints performed on Monday. Stafford has done better for me in the past, but Smith is playing the Rams, who we know are not that great. I have Stafford at 18.44 and Smith at 18.30, please give your input on these guys, maybe that will make my choice easier. Thank you