Marauder, there are two things that a Sith Lord can do that the Marauder cannot: Dark Side Corruption (which is useless if you have a decent amount of influence with your party members), and Crush Opposition (NOT Force Crush, ALL DS characters recieve Force Crush on Dantooine), which is a debuff, and for the most part this game is too easy to require debuffs. It's not like the Marauder is unable to dish force powers out, Force Storm costs a whopping 8 FP with the reduction for being DS, and the points regenerate at an obscene rate outside of combat, meaning that the extra points Lords get is a waste, especially since all classes can get FP buffs from simply talking.
In the same vein the Marauder's extra damage and all that jazz is really only a slight benefit in and of itself, and given the game's low difficulty the obscene amounts of health that come with the class don't mean that much, so what it boils down to is concept, and I rather like the idea of a DS bound juggernaut.
