LCD - Its reliability is very good. Its power usage is low. Its picture quality is not considered as bright as the plasma display but is getting better rapidly.
Both types of "New Technology" TVs are extremely poor quality relative to previous color TVs (1980's-90' 25 yr lifespan). They are made as "Disposable" units with 3-7yr lifespan. Extremely reliable for the first 12-18 months, then LCD displays become fragile and plastic within Plasma displays discolor from heat. Boards in both TVs usually have poor quality thin-film components (capacitors) with limited life if near any heat source (heat sinks on ICs, etc.).
The only advantages offered by Plasma TVs over LCD are:
1. Plasma TVs are easier to view in a "bright" room
2. Plasma TVs produce enough heat to dry damp socks (drying wet socks may be dangerous because of dripping into the TV).