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.
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As in, they could discover a civilization more powerful than precursors and forerunners combined a few galaxies over. You can't say it isn't possible.
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You can't say it will for sure happen, though.
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Your right. There's still that potential though.