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WORST: Terminals win at the price of Noah because then humans could investigate the cause of the plague (a biological attack from an alien species who have a grudge against the Galactic Empire) and start intergalactic war while the foreigners are shunted back home unable to do anything.
BAD: letting Diego win without anyone endearing themselves properly to him, trapping them all there in a cage of their own making. He doesn't care if they live or die and they gave him all the powerbase he needed to put them down if they rebelled.
NEUTRAL: letting the Terminals win without stopping the plague, by sacrificing Noah or otherwise, and the foreigners being stuck there with the Terminals to start the world over in a truce between natives and foreigners.
GOOD: the Terminals winning, apprehending Diego, and using the power of their research to send everyone that wanted to go home back, without option of returning.
BEST: actually to let Diego win, but with an emotional attachment to the foreigners that he would act in their interest as well, research technology to make an open gate between worlds, and leave the plague for bunk to keep Noah alive and thus never instate a war. He'd be more interested in reestablishing his connections and making nice with otherworldly powerplayers.