You would need to let us know what team would need WRs and what RBs they have. I like Rice more than Marshal simply because I like the Vikings offense more and Rice is the number 1 WR on that team.
12 Team League. We start 2 QBs and get .5 PPR, otherwise standard scoring
QBs: Stafford, Fitzpatrick, Collins
RBs: Charles, Mendenhall, Best, Starks, Carter, Karim
WRs: D. Jackson, Marshall, S. Smith, Green,
TE: Hernandez, Cook