Dynasty Value Cooper or Mixon

Who has more dynasty value going forward, Amari Cooper or Joe Mixon?

I would probably go Amari. He is a proven WR with a young QB whereas up to this point Mixon is all hype. I think Mixon will be great sooner or later, but you never know if he will get trapped in a RBBC for the next 5 years thus limiting his upside. Cooper will always be on the field most likely as a WR1 or very high end WR2.