Which players should i start week 12?

Currently 8-3 and have clinched the 3 seed in a 10 team standard scoring 6 keeper league.

Have A Cooper, C Sutton and T Lockett at WR
Have N Chubb, T Coleman, J Mixon at RB

Have to start 2RB,2WR,1FLEX, which player do you leave out?
For me I’m debating Sutton or Mixon, let me know what you think