Better Value ROS: Kupp or Cooks?

If you had to keep one as a starter and trade off the other, who would it be?

Want to upgrade my WRs this week and I have:

Allen, Cooks, Kupp, Sutton, Ridley, David Moore, T. Williams.

I’d keep both unless you can get an upgrade at WR or a lateral move at WR plus a RB. If you can, trade which ever can get you more