Fantasy Help

In my other league, i have to choose between

Joe Flacco vs Cle
Philip Rivers vs Phi

I want to start Flacco as he is against a terrible D where he put up 35- yards and a TD against earlier this season, and will bounce back after last week, or i can start Rivers who has been consistant all year.

also

Desean Jackson vs SD
Sidney Rice vs Det

Jackson is a big play guy who either gets a lot of points, or none. He doesnt catch a lot of passes and im in a PPR league.
Rice is also against the Lions and should catch a lot of balls, im leaning towards Rice

What does everyone think?