If you fought both sides, you would probably win against both, seeing as Vania was on his way to destruction, with his depleted military, and with the Concordat losing its leader and being generally non militaristic.

If you were on Vania's side, you would have certainly won, with your martial prowess and Vania's industry, you two would have made quite a foe. You would have only lacked in the navy portion but then again, Vania makes some capable meat shields.

If you were on the Concordat's side, Vania would likely never recover from the inevitable beat down. You probably do what Dalek did and leave the Concordat out of disgust at their weakness.