Kamara or McCaffreys in week 16?

He guys,
tough tough matchup in week 16…
Need every point there. Should I try to change my Kamara (vs. Steelers) for McCaffrey (vs. Falcons)
Games before are safe for me. Game after w17 it could happen that we are matching. Kamara (vs. Carolina) and McCaffrey (@Saints).
What would you do?
Thank you very much.