Waiver priority - WR or RB?

My WRs are Thielen, Lockett, Crowder, Tyler Boyd, and Westbrook.
My RBs are Saquon, Carson, Aaron Jones, and David Montgomery

I have an open slot and first dibs on the following players - who would you take? Half ppr.

WR options: John Ross, John Brown, DJ Metcalf, Hollywood Brown.
RB options: AP, Chris Thompson, Malcolm Brown, Burkhead

#1 Malcolm Brown
and only RB worth picking from that group but if you don’t get him and bid for a WR my personal preference is:
1)DJ Metcalf 2) Marquise Hollywood Brown, 3)John Brown