Diggs or Kupp?

Hey guys, I am currently in a Dynasty superflex league…My four top WRs are Ridley, Evans, Diggs, and Anderson…I have somebody asking for Drew Lock and Diggs…and is offering Hines and Kupp…I’m wondering if I can get more for Diggs…Or do you guys think Cooper Kupp is a good deal? Just don’t like his start…It’s also good to know that I have McCaffrey…so I need RBs…I have Todd Gurley and now Mike Davis/AP. Thoughts?