What game are you talking about. The old games on the normal Xbox?
I would choose both. On one memory slot I had a jedi and on the other I had a sith. I choose both because I would like to see how the way I choose would turn out and how the story would differ from one another.
I read books that take place after the movie (i'm such a nerd D and jedi eventually realize that the line between Dark Side and light side is really fuzzy.. and some jedi (like kyle katarn) can use lightning and still be a jedi