LCD, the plasma has a better picture but doesn't last as long as a LCD does, and it tends to burn a picture in the tv so you would have to do a pixel rotation. oh, it also puts off huge amounts of heat.
so if you want to heat your house in the winter with your tv, go with plasma,
but if you want it to last longer and have no problems, go with LCD. then again,
my TV's never last over a year or 2 because i usually get a new one ever year, or every other year