I'm TR, but if I was support an agenda it would probably be the VS agenda, because there's obviously some instability and discontent within the Republic - which is why it's a police state.
Which, in a war-game, totally appeals to me. They look a little goofy, but unbelievably badass at the same time. They also have this 'order at all cost'-dystopian feel to them.
That said, I might end up on either of the three factions in the end, since gameplay is what matters the most to me.