It all depends on what you're comfortable with.
If you want a look that's as close as possible to how it looks on film, use a cold cathode tube. However, these take a lot of energy to run, and being glass you have to worry about breakage.
If you want absolute reliability and lifespan, go with an array of LEDs with a diffuser in front of them. I believe VoodooFX (amongst a couple others) sell these if you are unable to put it together youself.