At first I thought the Borg might win, but I've been thinking maybe the Founders would win since they can turn into things like mists. I don't believe they could assimilate any of them because everyone that's been assimilated by one is a solid, and it would be difficult for them to get their cybernetic implants into a liquid, but who would win if they tried to kill each other? If the Founders were to get a few of their kind onto a Borg cube, they could turn into anesthetic gas that could render any of them unconscious like the queen and turn into giant winged creatures and take them to the nearest transporter and beam them out into space since they haven't adapted to being able to survive in that kind of environment.
God bless, Jason Irelan
God bless, Jason Irelan