There are alot of Pros and cons to both of these technologies, but rather than get into the technical side of things. It really boils down to one choice..........What size screen are you looking for ?
From 15" to 32" LCD is your only option, so if its a small screen you want, look no further.
From 37" to 42" PLASMA or LCD, There is quite alot of choice in this size, but as a shop we would reconmend LCD at 37" and PLASMA at 42"
From 42" to 150" We would reconmend PLASMA hands down every time, As PLASMA gives far superior motion, and much deeper blacks , which results in better colour, thus giving you a deeper, more natural picture.
In short, if you are buying a smaller set buy an LCD. But if your going big , there is only one true winner, PLASMA.