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 guess it really comes down to the Halo rings then. If the Star Wars universe can destroy at least one before they are all activated then they have a winning chance. If they don't it would be a stalemate...no wait..Star Wars has droids...hmmmm