Depends on your budget, what size you want and the usage. I can't say one is better than the other because it's not they both have pros and cons.
Plasma
Response Times - Response time is the amount of time, measured in milliseconds, that it takes for a pixel to go from inactive to active and back again. Athough the latest LCD screens have made big improvements in this area, plasma is still considerably better, so its picture quality generally suffers less.
Size - LCD is catching up, but it's still cheaper for manufacturers to use Plasma for really big screen sizes - certainly 42in and above - than it is for them to use LCD. On the other hand, plasma isn't really viable at sizes smaller than 32in.
Viewing Angle - LCD screens frequently boast viewing angles of anywhere upto 175 degrees. But our experience suggests that these figures are very optimistic, as LCD pictures start to lose lots of contrast and colour at angles much less than than those quoted. Pretty much all plasma screens, on the other hand, retain their quality upto around 160 degrees.
Colour Saturation - Plasma traditionally scores high here because of the way it blocks light, turning off pixels when they're not needed so that no stray light can dilute its coulours. With LCD there's always smoe stray light in the mechanism, which adds a greying influence to colours thus makes authentic tones more difficult to see.
LCD
Screen life - We've seen some industry claims that LCD can last twice as long as plasma (around 40 years at 4hrs a day versus 20 years at 4hrs of use a day). Even though we suspect that such claims show a distinct LCD bias on the part of the source, it does seem that LCD can last a bit longer than plasma.
No screenburn - Plasma screens are suspectible to something called screenburn, which occurs when a bright image, like the sky news logo, is displayed on screen for an extended period of time. The constant saturation 'tires' plasma's phosphors, leaving a permanent shadow of the bright image behind. LCD technology is pretty much immune to this problem.
Slimness - Because there is no need for gas filled or heavy glass fronts in a LCD screen, LCDs tend to be slimmer and lighter than plasmas.
Brightness - LCD technology can generally deliver brighter pictures than a plasma - though more brightness isn't automatically better if it is used to disguise a lack of contrast.
Power consumption - LCDs generally use less power than plasma TVs because they dont need to power hundreds of electrodes to stimulate phosphors.
It depends on how you'll be using it. Normally in htpc or kiosk cases I would deffo stick of an LCD, like I said before it depends on the size/price.
