Based on talent, then it's Moore.
However, David Nelson seems to have a less muddled situation playing for Buffalo compared to Denarius Moore in Oakland (esp. when Jacoby Ford and Louis Murphy return). Heyward-Bey is also in the Oakland WR mix since he is a favorite of the owner, Al Davis. That makes me lean towards picking up Nelson as of now.
14tm. PPR+IDP+return-yds. league
TE-Finley K & IDP-[streaming]