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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One other point that I want to make, from what I've looked up (Although I'll admit that this may be wrong), the Halo array can destroy all life in a galaxy (From what I've found it was galaxy, not universe). Well, Star Wars has more than one galaxy.