Arc is too close range, if they can rush really fast and secure a few kills then they stand a chance. Solar seems like the longest range with the most Damage over Time and area of effect capability, and area of effect in a war is priceless. Void seems to be on the same level as solar, but only because of suppression, we don't know the range of the void now, but it might be comparable to nova bomb, and suppressors can fly pretty far, but there aren't enough to cancel out every single super, they can either split suppression between the two other teams and leave a few unstressed targets to ruin their day, or target one side and have the other completely destroy them. I'd go with Silar or Arc, if void started suppressing everyone, the other two sides would see the obvious threat and annihilate void team. After that, solar seems like it can clean up nicely due to longer range+power.