I'm curious what is your favorite fallout 3 or new vegas mod?

Easy for me, Snake player race, from MGS3. (Avatar)
Until I find some other player race that is as good as this one, better or directly related to mgs given I'm a massive fanboy haha.

But for now, this race was the best gem I could've found for myself. Hell it was mainly the one thing that made me try out Fallout NV.
Having an open world as opposed to the original game and you're playing as one of your favorite characters.
It turns into a very interesting playthrough, having to match your talk choices/quest decisions to the character you're playing as, it's just a really fun experience to me.

Is Tale of Two Wastelands a cop out answer? It feels like a cop out answer. There are a lot of improvements in the engine and equipment choices *coughadvancedpowerarmorcough* for New Vegas, but I overall enjoy the Fallout 3 game more.

If I had to pick something that I have not not played without in a very long time it would be the Weapon Mod Menu. It solves my issue of the absolute nature of the default weapon mods.

New vegas bounties I and II. I think these types of quest should be in next fallout game, thrill of pursuing criminals was quite well executed. Although it lacked in some variety aspects, like the way to approach your bounty target.

Boom to the moon. Simply amazing quest mod i only wish it had more of that moon base and something more scary\creepy going on there during exploration. I don't want to get into details with this one simply to avoid spoilers, it's truly most amazing quest mod to date.

EVE(Essential Visual Enhancements): This is literally a "must have" type of mod, especially if you played fallout 1 and 2. This mod not only adds overly detailed re-worked weapons to the game, but also brings back good old glorious death visualisation similar to fallout 2 & 1.

Skunkwater Gulch. It's relatively simple quest mod and sadly unfinished, but it got it's charm. City is blooming with detail although lacks in depth due to mod being unfinished. Got some crazy styled weapon\armor arsenal with it too and it's not very lore friendly. Although if it's crazy and alien in nature with 80's\60's style in mind, it's pretty much lore friendly to me ^^

The Weapons of Millenia, Awesome quality and I love Guns!

Willow has a great quest line and detale and project brazil need i say more

Willow and Niner because their the perfect companions to have during a playthrough and there so well done to every last detail.

Dust Survival Simulator, It completely turns the game into a Day Z type game, it takes place like 15 years after the main story, there's no missions and only a few npcs left spread across the world, the only mod I had to stop playing after a while because it felt super depressing lol but its a 10/10 for me

Caesar's New Regime. It adds more Legion to the game, gives them some better looking armor, upgrades their weapon list (to me it seemed like it did), and actually makes them a force to be reckoned with.

Spice of Life is also nice. Just more variety in the armor and weapons.

this mod which adds the O.D.S.T armor from halo into the game. The author abandoned it though and it's a little glitchy

The Marie Rose race mod.

Marie Rose :

Star wars, I gotta say I love alot of mods. Im torn between the VGU sampler an Exciter Guns Mini Pack, but due to not having all of the VGU packs im going with Exciter's gun pack.

Exciters Guns Mini Pack:

I really like the NCR replacer by dragbody for New Vegas.
http://www.nexusmods.com/newvegas/mods/52721/?

A mod I really want to try is Project Brazil for New Vegas, it's almost like a new game from what I hear.

The NCR replacer is actually almost necessary if you download Caesar's New Regime.. The new Legion troops are too stronk for the basic NCR troops

I'd have to say that my favorite mod of all time is by far New Vegas Bounties. The story was just so great and, along with some custom weapons, made for a fun 4-6 hours.

Too many mods but Project Nevada would be it for me. It makes the game a more challenging, and add many features to it.

TTW by far, I know I could just play FO3 separately but, I like the fact that I can carry my character essentially making single play through last 200+ hours, and the sheer amount of mods I can bring over to the Capital Wasteland makes it better!

The mod I cannot play without is Weapons of the New Millenia. The textures are incredible and the fact that they're a little modern makes me use them every playthrough. I only wish I could find a mod besides EVE that adds a variety of energy weapons.

New Vegas Christmas special, It was so fun and it required me to do some thinking on how to comprehend the old man "Saint Nick" the overall mod was just so funny i could not resist making it my #1 favourite mod off all time

I m going to pick Weapons Mods Expanded. I really like weapons and the customization that this mod add make me want to have all the weapons with all the mods. Project Nevada is really good too.