There isn't "neutrality" in the SW universe, by me.
Well, both sides can offer interessting gameplay, but i think sith is cooler, cause you can use all the Force for wathever you want. Just gives uou more freedom.
Playing light also has his advantages. I realy like kicking sisth asses and demonstrating, that the light side isn't weak.
But i think the gameplay will be far more interessting, if don't seek to achieve mastery in one of the sides, just acting as you would realy do in the real world. But the light/dark system is not very good, by me, so i think we'd better seek to achieve such masteries, mainly for thhe bonusses.