I mean without Star Wars, Halo wouldn't exist.

If by the word "entire" that also includes the Flood at the height of its power, then the Flood alone would be an apocalypse to Star Wars, sort of like how what the Vong did to the Galaxy, only worse. There comes a point in Flood evolution where it is mathematically impossible to hold them at bay--as holding them at bay requires the use of resources, resources that the Flood in turn consume and turn against you, adding to their army while taking from yours--and the denser the victim civilization's population is, the faster the flood will grow. In this scenario, at the height of power, the Flood has already consumed the entire Forerunner civilization and all of its technology (this is to say nothing about their Precursor masters, that's another apocalypse entirely), as well as many other galaxies (source: Silentium). The Forerunners themselves would be a colossal threat to the Galaxy, just take everything they had and put it into the hands of the Flood. At that point, the Flood have already surpassed the point of no survival, where the mathematical impossibility of holding them back has been reached. And here we're sending them to feast on one of the most biologically/technologically dense and diverse universes in fiction? It's a numbers game at this point. As for their Precursor masters, all they have to do is subvert or disable all technology in 2/3 of the Galaxy like they did to the Forerunners and really all Halo needs is the Flood to win. Star Wars' A-game is found in far too many superweapons, nearly all of which can be subverted by the Precursors' tech-hacking abilities. Star Wars relies on one-offs, without those superweapons its useless against the heavy hitters, it has too many of its eggs in too few baskets, where the heavy hitters of Halo are all super weapons in of themselves.

i would initially think this would be a close battle considering the flood, forerunners, precursors against force users and stuff like the star forge but then i remembered [url=http://www.youtube.com/watch?v=RW_hGOFukMQ]this[/url] i think with the blatant disregard for life that many of the halo factions have, this would prove an effective strategy (a single flood ship crashes into a star destroyer and everyone on board is potentially screwed)

A Star Wars droid can't hit the broad side of a barn if you see the battles they miss by a mile

One other point that I want to make, from what I've looked up (Although I'll admit that this may be wrong), the Halo array can destroy all life in a galaxy (From what I've found it was galaxy, not universe). Well, Star Wars has more than one galaxy.

People always overlook the fact that Halo AI are some of the most advanced AI in the SciFi universe. One Unsc smart Ai could cripple half a fleet if put into the right system. Also if things go bad, Just shield world and set of the halo's emerge victorious. Mop up the droids.

Well jedi kyp Durron blew up 3 planets using the force and the empire would destroy the covenant fleet along with UNSC home fleet. Laser technology crushes bullets and plasma dont believe go to wookipedia.com and look it up. Hyper space is far faster then slipspace the precursors if anything may have had laser tech but if they alone had it compared to a whole galaxy well bye bye precusors. If Halo tried using the halo rings starwars has the droid army so starwars still wins. The flood would be wiped out by the empire since when dealing with parasites the empire would sta y in orbit and bombard a planet until nothing is left much like covenant glassing but once it is done with lasers the planet becomes uninhapitable much Like our moon. Lightsaber beats energy sword. the clone commandos could handle the spartans. I have yet to include all of starwars forces and weapons and even still starwars has the edge.

Oh shit I forgot about the Forerunners. Plus everyone in Star Wars beside Han Solo can't shoot a gun for shit.

What's to stop the Yuuzahn Vong (Who live in a different galaxy than the other factions) from terraforming the Halo array and taking control of it? Or the zombies from the Star Wars universe to infect the Forerunners? Heck, the Mandalorians have armor that light sabers cannot even penetrate, so how would the Flood or any other small-arms weapon penetrate it?

Precursors. Need I say more?

The Star War universe seems very populated with life, technology and skills.. I think the Star Wars Universe would be better

Sigh, more Halo kiddies and their lack of canonical knowledge... http://starwars.wikia.com/wiki/Star_Forge http://starwars.wikia.com/wiki/Sun_Crusher http://starwars.wikia.com/wiki/Darth_Nihilus http://starwars.wikia.com/wiki/Force_storm_(wormhole) http://starwars.wikia.com/wiki/Centerpoint_Station http://starwars.wikia.com/wiki/Shawken_Device Hell, just read half of [url=http://starwars.wikia.com/wiki/Superweapon]this.[/url] Pre Rebellion Star Wars > Pre Human/Forerunner War, and well basically everything else in Halo. Pre Human/Forerunner War > Post Rebellion Star Wars. Post Rebellion Star Wars > UNSC/Covenant War.