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 think the greatest advantage Star Wars has is its infinite potential. In Halo, the universe has been defined and [u]bound[/u]. In Star Wars, nothing is set in stone and as such has infinite capacity to expand and become infinitely more powerful than the Halo universe.