The difference between them are vast. The difference between them are mainly how the actual picture is displayed (internally). Plasma is a dying technology as far as I know and is being phased out. LED is probably the wave of the future. LCD should be around for a long time though. If you are wondering what you should buy then I would recommend buying a LCD from Dynex or Insignia because these usually do the job of the more expensive tvs for a fraction of the cost. If you buy Best Buy's warranty you will be worry-free.