This idea just came to me recently, so I wanted to put it on the forums and see what people think. For those of you who don't know what the Burning Legion is (which is understandable) click [url=http://wow.gamepedia.com/Burning_Legion]here[/url]. And please say why. Personally I vote the Covenant because they have a fleet, look it at this way: over 150 Covenant ships were there during the war on Reach. And that was only a small portion, the Legion does have an edge in numbers. Count the grains of sand on a beach and you'll have a rough idea on how many demons are in the Legion. Sargeras is really the Covenant's only problem, Mannoroth is gonna get rekt by the Covenant cruisers. So those are my thoughts.
Edit: Forgot info on Sargeras. I'll post a link later, but this was said about him:
"The Burning Legion is but a shadow of his terrible darkness. Trust in me when I say that we have hope even if every demon who serves him comes through, but no hope if we destroy all only to have him step into the world."
— Krasus
Edit: [url=http://wow.gamepedia.com/Sargeras]Here's the info on Sargeras.[/url]
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Honestly, from what that said about the legions, I'd say the covenant. The legion apparently was prevented from destroying more worlds. The covenant wouldn't have been stopped if master chief hadn't been involved, meaning that the covenant can probably destroy the legion more efficiently. All they have to do is sit in orbit and glass everyone... [spoiler]Or the arbiter could pull some kung-fu on the legion's ass.[/spoiler]