In both storylines there is the option to make your character driven to change the Empire from within, either to your own liking or just for the better of the entire Empire. Inquisitor does it best because he becomes his own boss without a master, having it all be a part of his big power play plan.
Sith Warrior is always beneath someone, even if he becomes one of the strongest Sith. Then again, there is still more story to come.
The warrior obtains a higher position within the empire than the inquisitor doesn't he?