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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I would also like to point out that activating the halo rings does not grant an automatic win here. As the rings will also destroy all of the halo universe it is not a victory and the way I see it, it is an omission of defeat that you could not defeat star wars with out also destroying yourself.