I'd use both, and let my own morals decide my actions.
They actually do have people in Star Wars that do this, such as the Grey Jedi.
Jedi and Sith are both extremist idiots, and both have made HUGE mistakes.
Jedi: Kotor's Mandalorian War: Caused chaos that continued for hundreds of years, all because the Jedi Council decided it would try to stay away from the fighting. If they had actually supported the Republic, it's a good guess they would've been able to keep Revan from turning dark, or at least stopped him before he found the Star Forge.
Sith: Um, just about everything they've done, ever.
If I had to choose one or the other, probably Dark, but I'd try to change the Sith ways so that stabbing your comrades in the back was considered a bad move.