I would say Steve Johnson simply because Fitz looks like a promising young QB and Miami's crazy offense doesn't really favor the long ball. Plus WR competition-wise I like SJ's chances supplanting Lee Evans over Bess's taking over for Marshall. Having said all that, it's really a coin flip between the two.
QB - A Rodgers, E Manning
RB - A Foster, S Jackson, R Mendenhall, T Jones, R Bush
WR - G Jennings, L Fitz, S Smith (Car), P Harvin, V Jackson
TE - A Hernandez, J Tamme