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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Easily halo for the sole reason that they have us. [i]The Flood.[/i] But on a serious note. I can't think of anything Star Wars has to combat the Flood. There has to be myriads more civilians in the Star Wars universe because there were so many different species there. Thus more bodies the flood can use to overwhelm them.