Plasma Tvs like to burn-in more then lcd/led TVs. Don't know too much about led TVs, but the input lag was horrible when I tried it. I just stick to LCD TVs for the time being.
I've got a 42 inch LED and previously had an LCD and the LED outshines the LCD by far, the picture quality is so much sharper and just the look of the LED TV's is enough to make someone go out and buy one so smooth and slick. LED FTW! SNM