AA for Speed and chance to double attack with special use (read: if a Rebel uses a special attack under an AA lead another Rebel will use their basic attack). Wedge for Crits and heals (Wedge's leader for healing with Crits makes him the best healer in the game, provided of course you are running Rebels).
I'd actually ditch Sun Fac - he's great and all but gets no bonus from a Rebel team (he really only gets a bonus from Poggle who no one is really running these days, does well in a Dark Side team due to his debuffing ability). StH (Stormtrooper Han) works a lot better as does K2-SO.