Do or Die flex delemma. Chubb or Cooks?

Hey all, fighting for the final playoff spot with a bad start to week 13 on Thursday with M. Thomas. My other receiver is A. Brown so I’m starting him, as far as RB’s go I got A. Jones and P. Lindsay ready to roll.

Flex is where I am struggling. B. Cooks or N. Chubb???

Currently I have Cooks in the lineup, Chubb has a tough matchup against Houston.

Thoughts?