Who will have the better career, Randall Cobb or Titus Young?

Also, this is excluding Cobb's play on special teams this is purely receiver for receiver. I just wanted to do an analysis of the two promising 2nd round NFC North draft choices. Randall Cobb likely won't be making an impact in the Green Bay offense as early as Young because of how far down he'll fall down the depth chart. However he does get to benefit from developing behind a crazy talented receiving corps and maybe a better opportunity to utilize his full potential. I just wanted to ask everybody: Who do you think will retire with better career numbers?