Mcknight is a high risk/reward play to me. He's a little small, has ball security issues, and his run mechanics are slightly odd. But he does have the buffalo d on his side. Torain has a rough matchup but is likely the safer bet. I just didn't care for what I saw from video of Mcknight.
*Edit* Messed up clocks mean I didn't realize the games had started and that my answer was too late.