Covenant vs. Chimera

Covenant Empire: A mighty empire made up of several races united in a shared belief, the Covenant run on a cast system: Prophets, Elites, Brutes, Drones, Grunts, Jackals, Hunters, Engineers, etc. Their faith was so strong, that those that were non-compliant with their beliefs would often face a genocidal war in retaliation. One of the most powerful military force in the known Milky Way galaxy, the Covenant sought to activate the Halo Array, believing it would allow them to transcend mortality.

Chimera: Hailing from an unknown planet in an unknown sector of the Universe, the Chimera's technology is about 60 million years ahead of mankind's. They come, monstrous in form but shockingly intelligent, with the sole mission of wiping mankind from the face of the planet. Lead by Chimera baring the rank of 'Angels', they corrupt humans through use of a virus, making them into Chimera hybrids which serve the Chimera war machine. Those that are not changed... are destroyed utterly without mercy.

Now, two mighty empires shall wage a war for dominance. Will the Covenant destroy these heretics for the glory of the Winding Way? Or will the Chimera spread their sickness across the various races of their opponent? Lock and load ladies and gentlemen, because bullets are about to fly, and plasma blades are ready for blood. Soon, only one side will remain, all to answer the question...

WHO! IS! DEADLIEST!

*(Because I know this will pop up if I say nothing: No space battles. Planet-side only.)

(Disclaimer: Just to be clear, these two combatants were created / are owned by people far more creative / wealthier then me. I have made this, not for profit, but in the hopes of encouraging spirited discussion among fans. Please support the combatants official series. Thank you, that is all).