I can answer from a computer monitor perspective. We use both CRT's and
LCD's at work and by far CRTs will last longer and are more reliable.
That does not make them better per se but you will have to weigh out
the advantages. CRTs usually have a truer color and have greater
latitude in adjusting the resolution and color and are cheaper. CRTs
are heavier, consume more power, and put out minute radiation, and are
very costly at extremely large size screens. LCDs are a decent
compromise between color and resolution, can be larger, and are
lighter. They are much more expensive though. I would say if you spend
a lot of time in front of your tv, see which one you have to struggle
to see or feel comfortable. At 20" I personally would stick with a CRT.
Heck, go for a 25 or 26", they are not that much more expensive. My 2
cents.