For me it is Elite Riot Gear from the DLC Lonesome Road

I would say its between the Legate Armour and Advanced Combat Armour.

there are just too many great armors - but this is one of my favorites: Colossus t49xv by Dae
http://www.nexusmods.com/newvegas/mods/42756/?
it looks awesome and the helmet is badass.
of course there any many other fantastic armors - i like the Heroes of Apocalypse from Dragbody a lot and for a long time Chakan was my man
http://www.nexusmods.com/newvegas/mods/58717/?

Default game it has to be either the Veteran ranger armor or the T-45d.
Mod armor is probably the Colossus XV Enclave Rework armor.

Before lonesome road or any dlc as a matter, I like the NCR veteran armor and I am sure it was everyone else's favorite. If not that armor it was the T-50b armor if only it didn't glitch super hard twisting your shoulders everytime you sit down. After the dlc came I really liked the stealth suit MKII so much but lonesome came out then I immediately fell in love with the elite riot gear. That armor looks so bad ass and I know it is everyone's favorite here.

Definitely the Elite riot gear because it looks sexy, stats are good and it's overall better than the other medium armors.

If we're talking Fallout 3, New Vegas and 4...man I really love Joshua Graham's armor but the original Leather Armor from Fallout 3 was just 'so' nice. I really hope someone goes back and attempts to remake it once the G.E.C.K. is out. Graham's armor wins this topic though

Obviously the NCR Veteran Armor!

The NCR veteran armor is one of the best looking armors but I love the merchant outfit.

Mine would have to be the NCR Ranger out fit, the helmet looks amazing especially in the dark. The glowing of the eyes just makes me wonder what the npcs are thinking when they see glowing red eyes in the dark.

The Lightweight Leather Armor. All the simplistic rugged-ness of regular leather armor, without the annoying shoulder clipping when aiming. Bonus points for working well with Tailor Maid Bandoleers and Flashlight Belts. =P

I love the Elite Riot Gear found in the Divide, good shit, good stats.

Any Power Armor, I love it, since they offer great stats (except for mobility).

I love dragbody's armor mods, especially Willhaven armor packs and the BF4 armor.

For semi vanilla, I wear vanilla or Willhaven armor with Jtucker's Wasteland Warfighter mod that adds tactical gear like Plate carriers, chest rigs, kevlar helmets, etc.

If we're speaking in vanilla armors then my favorite has to be the Stealth Suit from the Old World Blues DLC. I absolutely love the talking armor bizz.

My favorite armor mod is The Wasteland Prophet. I just love the hood and the armor plates on it. It looks pretty cool. c:

For me, it was probably the NCR Riot Armor, it's such an awesome looking and has a look to drive fear into enemies that I loved.

But I also really liked the NCR Ranger armor as well. But between the two, I would go with Riot armor.

My favourite armour in vanilla game is T-51b power armour of brotherhood in my opinion it`s a symbol of all fallout series

Vanilla Game, I like the Black Combat Armor you get from the Van Graffs. It is a good mediam armor and the black reminds me off Talon Company.

Mod wise I love the Deathstroke armor Dragbody did. Who doesn't love Deathstroke? I wear it all game it is my fave!!!

RCSS armor ftw pls

The Desert Ranger armor looks pretty sweet to me and i really loved the rugged looks/details

i really like the standard NCR Ranger Combat Armour (aka the black armour) as well as the Enclave Remnants armour. They both are very good stat-wise as well.