Maybe a contrary take, but I would hold onto Watson. I think Wentz’s playoff prospects are being over-hyped. My model has him projected to be the QB18 Weeks 14-16 and the QB20 Weeks 15-16. And Watson projects to be the QB2 Weeks 14-16 and Weeks 15-16. Championship Week (16), Watson is projected to be the QB1 and Wentz projects to be the QB24. Every player has a price, but for me the difference between Watson and Wentz is extremely high, especially in the playoffs.
My full QB model is below for reference. If it helps you can see all my streaming models (QB, TE, DST) in my Week 11 streaming post here. Comments and feedback very welcome. Good luck!