The Haloverse wins due to the fact that two races have technology that trumps anything Star Wars can pull, and another that adopts any and all levels of technology. The Precursors are a universal force, practically part of the fabric of reality. Their creations are enormous, to the scale of entire solar systems. Their empire spans over multiple galactic clusters. The Forerunners sat just under the pre-cursors on the technology scale, and are able to manipulate gravity, time, and other dimensions with relative ease. They are capable of extra-galactic travel, and can build constructs ranging from the size of a planet to something that completely envelops it, and have extensive knowledge of building in slipspace. The flood adopts whatever it absorbs into the collective, meaning if one Jedi was ever consumed, there'd be serious trouble. And you forget how fast the flood spreads once it starts. When it has access to ships and large amounts of biomass, planets become organic supercomputers that can rival and best even the most advanced AI. Air is converted and filled with spores so that any who even breathe the atmosphere are eventually infected, and if one ship makes landfall, we're talking total planetary collapse within hours. These three factions alone would give the Star Warsverse serious trouble. Throw in ancient Humanity and all the other alien empires, plus modern Humanity and the Covenant, and you have an enormous line of canon fodder like no other.