The light side.
This is not some abstract or fictional choice. The light side refers to authentic spirituality based in peace, love, and calm. The dark side refers to the basest natural tendencies in humans, the most banal.
The light side is the only route to true happiness (what we call "eudaemonic" happiness). It is the only route to making a difference worth enacting. It's the only route to the kind of life anyone wants.