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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You don't even need all of halo. A single precursor would wipe out the entire Star Wars population [i]universally[/i] or banish them to a new universe where they decide what works and what doesn't. A precursor's thought process is quicker than a wave of the hand by the way.