I tried both Marauder and Juggernaut in the beta up to lvl 25. And I'm defiantly going for juggernaut. I liked Marauder a lot, but only up to a certain point. I don't like the double lightsaber aspect of it. I just want the one. And although i could dish out a whole lot of DPS i couldn't take that much damage. So i felt that downtime was to much for me. When i played the juggernaut i felt stronger! Not necessarily in a DPS kind of way but i could handle much more damage being given to me. And i did a lot (Enough) damage to take down pretty much anything. And after i got Quinn my healing companion i was unstoppable.
So yeah. I'm defiantly going for the juggernaut.