Peyton or Big Ben?

[thisizbatcntry]

I have Peyton Manning and Ben Roethlisberger as my two QB's, and I can't figure out who to start. I have started Manning every week except his bye week (for obvious reasons), but this week I'm not so sure. Baltimore is a much better team than Kansas City despite their current problems, and after Roethlisberger's loss against Cincinnati, he might be looking for a huge game today. So who do I start - Peyton Manning vs. the Ravens or Ben Roethlisberger vs. the Chiefs?