Led or Neon underbody?

I want to get yellow but not sure if I want LED , or neon.
Pics would also be helpful.

I have heard yellow looks bad. And LED would be brighter, but goes out from your car. Neon is more glow and strong, and I think it makes more of your undercar glow. It's all to do with the angeling of the tubes too I think. But Yellow looks bad. I saw one in person the other day, and I could hardly tell there was one on, my friend had to tell me to go down and look closely at the ground.

Yellow LED's are amber. When I had a yellow/blue combo I emailed like 15 LED distributors telling them I'd buy 20+ if I could get yellow LED's. Most either said they weren't yellow or sent me samples... Phil (pre Oznium I think) and led-lights.co.uk did both. I tried playing around w/ resistors too... couldn't get any extra yellow... mostly you're just SOL.

(goes the same w/ yellow Cathodes -- I tried a ton for those too)

are the yellow neons good lookin?

yes, they look very yellow.