Like everyone mentioned above, the CCFL is basically a glass tube and the SMD is more "LED" like and brighter.
One very important issue to consider is longevity between the two.
While they are priced the same, the SMDs will last longer for two reasons.
1.)There is no gas in the SMD's to "burn out" or "leak" and...
2.)The SMD's will handle shock and movement much better than the CCFLs will.
I mention this so that all buyers can make a solid, educated choice when it comes to selecting the correct afterburner model.
When you're ready for the best deal on either, shoot us a PM or email.
Thanks and enjoy!!
Ivan @ Southwest Speed