The Star Wars universe would be able to shut down slip space using multiple methods(the force, electromagnetics etc.) and trap the halo fleet in between slip space or even redirect their approach into a star or black hole. The Halo universe UNSC communicate through the vast distances in space using a black cypher. In Star Wars they have instant communications using some exotic form of wave that can travel faster than light. The list goes on and on Halo can't beat Star Wars as much as I like halo.