There are lots of factors that go into differentiating monitors and TVs, the largest of which, JLee has mentioned. I particularly favor Dell panels for monitors (currently using a no-name Korean monitor that uses a Dell panel) because of their quality track record, especially their UltraSharp line, and Samsung for TVs. I use
TFTCentral when it comes to looking at monitors and
LCDTVBuyingGuide for TVs. Both sites calibrate their displays before reviewing and even provide their calibration information and/or profile files.
That's probably a bit too much information, so to go back to simpler things:
IPS have great viewing angles, but wont provide the best blacks, and are more expensive (movies, other media, etc...) - comes in numerous named generations of IPS
TN are inexpensive, usually have higher refresh rates and faster GTG response times, but typically colors distort rapidly when viewing from other than straight-on (gaming and general computing) - comes in LED-LCD (AKA LED) and LCD
Plasma have wonderful black levels and refresh rates to capture movement (sports and movies), but suffer in decently-lit rooms, and is an abandoned technology
As JLee stated, LCD use more energy. LED usually provide better contrast and color reproduction as well. In any case, the major brands almost-exclusively use LED now, so that's less relevant today.
Check out
this article to read on monitors vs TVs.