 00-00-0000, 00:00 PM Well Borg Vader versus a singular Alien obviously goes to Vader, but as we have seen, whenever the Alien race meets another race, the Aliens always end up winning, even when they lose (I'm quoting Alien Versus Predator on this one, as terrible as it was). So while the Borg are good at assimilating the Aliens, in doing so they would undoubtedly be infected with the parasite--leading to eventual Borg extinction. Their ability to copy technology does nothing in the face of the Alien. 