Here is a list of videos that lists their mods to visually overhaul New Vegas.

ExoticRPGs:

NcrVet:

The Ranger:

JuiceHead:

i dont use enb too much because my pc cant handle it (even though it from 2015) i only use weather mods but for my favorite enb i think its Jay ENB

each enb is different and playoff different strengths and weaknesses, if you are looking for more colorful vegas, stick with Rudy. If you want gritty vegas go for dynamo or cobalt. I prefer enhanced shaders due to how versatile it is when new world space mods are loaded. It all depends on what you want your game to be.

My favorites ones for FNV are:

1. Forlorn ENB https://www.nexusmods.com/newvegas/mods/65861
2. 47 ENB 2: The Sequel https://www.gunetwork.org/t2762-fnvrelease-47-enb-2-the-sequel
3. Jay's ENB [Search google to find it.]

Honorable mention Rudy ENB https://www.nexusmods.com/newvegas/mods/55076/

I enjoy colorful ENBs from time to time, but my favs are usually desaturated ones hence why Forlorn is at the top.

On the other hand there are tons of ENBs I still want to try, but yea that is my list so far.