I'd be on the Murray side, although MJD is the better RB, I think Green is the far better option at WR and will be the more consistent target! Also have to take into account whether it's PPR because that makes MJD worth that much more as he is involved in the passing game. Although Murray pretty much has the job locked down so although he probably won't have as many big games as MJD, he'll be "the man" in the backfield in Dallas so he'll have a long leash!
QB: Jake Locker, Ryan Fitzpatrick
RB: Jamaal Charles, Adrian Peterson, Trent Richardson, Peyton Hillis
WR: Dwayne Bowe, Vincent Jackson, Jordy Nelson, Marques Colston, Kendall Wright, Michael Floyd, Alshon Jeffery
TE: Vernon Davis, Heath Miller