Tough choice, as you have two solid options here. Both guys are easily the #1 guy in their offense. Jackson is the more talented of the two, but Hartline is seeing more targets than anybody.
I think this is a coin toss, but I might go with Hartline because he has the hot hand right now.
QB: R Griffin III, A Luck
RB: A Foster, F Gore, T Richardson, K Hunter, M Hardesty, A Green
WR: V Cruz, M Austin, P Garcon, S Moss, B Hartline
TE: J Witten
K: Matt Bryant