So........here's the beef.
LEDs
can be brighter, depending on how they are designed. There are a LOT of cheap eBay lights that have "LED" halos..........which consist of 1 or 2 LEDs in the halo. Example, this set of Mitsu lights I did:
LEDs, on:
Swapped them to CCFLs:
on, during the day:
The halos in the Mitsu had 1 LED at the bottom of the smaller halo, and 2 LEDs in the larger ones. Very dim!
CCFLs are typically cheaper, and as mentioned - a uniform look. The LEDs that are done by companies like AAC are VERY bright (almost too bright!) and have small gaps between then. That gap........drives me NUTS.
Personal preference? I like CCFLs. Even though I have broke a few.......they are smaller (if done in a raw ring) and can look quite well on the end of a shroud!
or even built into the shroud for a nice custom look: