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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Some of the Star Wars Extended Universe shit is pretty damn powerful. The Celestials, beings who basically [i]controlled[/i] and manipulated the force beyond any Jedi or Sith (aside from maybe Nihilus) ever could. They could create life, balanced light and dark, all that fancy stuff. They created machines that could move planets into different orbits, and forget the Forerunner ability to destroy solar systems... They created the mother -blam!-ing MAW. And that is the largest collection of black holes in the known Star Wars Universe (at least until it was destroyed). It was created to house The Mother, which I won't spoil you on. Seriously. You can try and pull out the Precursors in a fight like this, but the Celestials are to Star Wars what the Precursors are to Halo. Trans-sentient life-creators, whose own power was practically unmatched.