I have seen the ColorDMD LCDs and they do some wonderful things with the animations on a pin, but to me the physical attributes of the LCD panel does not resemble a 25 year old pinball machine part. The ColorDMD LED looks like the old part with magical colors added.
If you are not concerned about adding 'new' technologies to an old pin, then that would be a big 'don't care'.
There are of course the other reasons I like ColorDMD LEDs that have been discussed like fit, brightness, and viewing angle that add into my LED bias.
I do fully support putting modern LCD panels in newly designed pins. JJP rocks!
Just my personal view, just talking up the ColorDMD LEDs to replace gas displays.