Who to start at RB Week 2? Kevin Smith or Darren Sproles?

I have Steve Slaton has my RB1 and need a RB2. My other considerations include Kevin Smith, Darren Sproles, Reggie Bush, and Ahmad Bradshaw. I figure it's between Kevin Smith and Darren Sproles, especially since LT is out for this week, but they both are going up against strong defenses. Mainly between those 2 but I figured I'd list other options anyway.