The way I've always decided between Rogue/Fighter is:
If I have a capable weapon set that is either sword/axe/club, and a heavy armor, then the choice is simple: Fighter
If I have a a capable weapon set that is either dagger/staff, and a light armor, then the choice is simple: Rogue
I think it's best to play to the strengths of your items. If you have an amazingly good heavy armor comparible to just a decent scale armor, then go Fighter and work on the weapons.
If you have amazingly good weapons that Rogues can use that Fighters can't, then concentrade on getting scale armors and lighter and play Rogues.
Yes Dark I am back to bring the law. I am so busy with college and work and a new girlfriend, but that doesn't mean I can't help my guild when I find the time