Go with neon, it has a smoother light and its the best for ground effects.
I know, I have had both.
You just need so many leds to compare it with the neon glow.
Leds create hot spots while neon does not, in ebay you can get some 15'' neon bars and they rock.
Ill tell you, I went with leds first, but I wasn't happy at all so I went neon and now I love them. I just wasted my money with the leds and they were more expensive!!
My neons are brighter than my leds.
These are my leds:

These are my neons: