i think that depends on how much you read. between the star wars movies and halo it would be a tie, but star wars has this huge background story, which makes star wars much more fascinating for me.
I agree with Revan. There is so much more to star wars. plus you have the military might, the few Super Star Destroyers that are left could defeat the elites and humans and everything else. plus its about a hundred jedi vs master chief.