Well, I would side with The Republic in general, though the Republic has been shown to be pretty corrupt at times too. Really, I side more with The Jedi, defending peace and justice regardless of political concerns - at least up until the very end of course. Still, neither were as evil as the Empire, so that's a hard no on that.
Realistically, I wouldn't be some kind of awesome fighter or something, though if I could pick, I would be some kind of fighter pilot, or Jedi with an emphasis on piloting skills, like Jedi Ace Sasee Tiin. More likely, I'd be doing exactly what I do, working in revenue management for Star Tours or The Halcyon or something.