Buying low for Chris Johnson. Johnson for Andre Brown?

[Dude_202]

I'm being offered Chris Johnson for Andre Brown straight up. My other RBs on my roster are Matt Forte, Jamaal Charles, and Doug Martin so either way, Brown or Johnson are going to sit on my bench. Which RB though would be more appealing though to have on my bench? Does CJ have a chance to turn it around or should I just stick with Brown and hope he supplants Bradshaw as the starter?