My favorite level was Halo 3’s “The Covenant” I liked the music and you just get that feeling that you’re about to whoop Truth’s -Yoink-. And then you get that “hope” feeling when High Charity containing Cortana crash lands on The Ark. I like using the vehicles also, expecially using the Hornet fighting ground forces, Banshees, and the two Scarabs while your ODST passenger destroys infantry with the Fuel Rod Gun you gave him.
My favorite is probably The Storm or The Covenant.
Either The Silent Cartographer from CE, or The storm from Halo 3.
That’s VERY hard.
I don’t think I even have an answer. New Alexandria was fun but The covenant more diverse in gameplay. But The Covenant was an endless stream of heavy fights and ODST put more story into those Like with The ONI HQ mission.
I think Data Hive & The Highway mission from ODST stand against The Covenant and Halo from Halo 3 IMO
I can’t choose though.
Well, since you weren’t specific on “Level from any Halo”, i’ll just go with The Pit because that is a level in Halo 3 
Mine is crows nest or Tsavo Highway from halo 3.
I have at least one favourite from each of the games I own so hopefully that’s okay to share.
Halo Reach: Long Night of the Solace. It was awesome to fight in orbit and then board the Corvette, it’s just a fun level.
Halo CE: That’s a hard one, considering the fact that I haven’t played through it as much but I think I’ll go with The Silent Cartographer. I’ll circle that island for the hell of it.
Halo 2: The Arbiter. Love fighting the heretics, and the new music in the Anniversary version is epic.
Halo 3: The Covenant. It’s so epic to fly the Hornet, especially when you destroy the two Scarabs and venture into the Citadel, to watch the Arbiter kill Truth. That level was the most exciting.
Halo 4: Either Forerunner or Midnight. But I you want me to choose one, then I’ll go with Midnight. It’s a hard level but it’s the most epic one. The music in it is thrilling when you fly Broadsword and go to disable the Didact’s shielding around the Composer. It’s a challenge all of it but I love the design of Mantle’s Approach and the music. But also I really love Forerunner because it’s also epic even though the Didact doesn’t awaken until the end, and you have to book it outta there. I’ve played Forerunner more than I’ve played Midnight, so I know that level pretty well, mainly because I was trying to beat the par score, and haven’t succeeded yet. I was so close once before a patch fixed it and lowered it.
I don’t have a particular favorite, but I can list one from some…
Halo CE: Halo. Loved driving around the ring and saving marines. So alien and mysterious…
Halo 2: The Arbiter. Just cool going stealth and working with elites for the first time.
Halo 3: Sierra 117. Fighting through the jungle was fun for me, and it was a great intro level.
Halo Reach: Tip of the Spear. Taking the fight to the Covenant was fun, and had a great, epic intro cutscene.
Halo 3: ODST: Skyline. Sniping on the rooftops then defending the pelican was intense at times.
Halo 4: Requiem: Almost similar to the aspect of why I loved the level “Halo”
Halo 1: Keyes
Halo 2: Gravemind
ODST: Uplift Reserve
Halo Reach: Pillar of Autumn
I’d have to go with Mombassa Streets from ODST if that doesn’t count as a level then I’d say the Pillar of Autumn in Halo Reach.
Shutdown in Halo 4 greatest ever
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The Ark in Halo 3, NMPD HQ in Halo 3: ODST, and Either Nightfall or Pillar of Autumn
The Covenant is always the first level that pops into my mind when people ask this question. I love it!
Quarantine Zone - Halo 2 . I’m just as surprised as you are.
So many good choices that i honestly cant decide, but if i had to choose i would say Assault on the Control Room.