Here is my breakdown
Guard play
Lee, Lewis, Q, Mitchell - advantage in shooting.
Murray, Ulis, Briscoe - advantage driving to the basket.
Center
Onuaku is stronger on the boards than SL, but is more foul prone. SL is better at shooting from 10 to 15 feet. Adv Onuaku if he stays out of foul trouble.
Power forward
Spaulding, Johnson vs Poythress, Willis
A push imo, I think that this position will dictate who the winner is.