Both are pretty bad options. Charles' breakout game cam against the Raiders D which could make Blair Thomas look like Ladainian Tomlinson. Cadillac is the better back and is facing the weaker D but Radio Raheem insists on splitting his carries with Ward plus the Bucs are probably going to abandon the run early when they fall behind.
Start Charles or actually I like Manningham better but I always start a minimum 4 RB's. Get someone off the waiver wire.