Who wins?
By entire, I mean EVERYTHING. Halo, for example, would have all of the Precursors, Forerunners, Covenant, Flood, and Humans all teamed up against ALL the Star Wars universe
They all have their technology as well. Halo has their Halo Rings and such, Star Wars has all their Star Destroyers and Death Stars and all that
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Let's see, there are many factors that give both sides an advantage. Light sabers and the force could get through most, but, the flood spores and the precursors would basically even that out or ruin everything. Then, Droid could fight off flood possibly. The Halo array could wipe out both universes, but would require yet another activation index.