It’s actually a super common misconception that plasmas are bad – I sell TVs, been an expert on them for about 5 years now, and I hear this from customers all the time and it drives me crazy! Nearly every one of my coworkers and all the experts own a plasma TV, they get far deeper black levels, are better for motion, and have the most accurate picture. Many of them come with energy star ratings, put off a minimal amount of heat, burn in is rare, and they cost far less than LEDs. The problems you are hearing about used to be true but no longer are, people are basing their experience and opinions off of old TVs so it’s very inaccurate.
LCD – Matte finish so there is no glare/reflection. Average brightness. Come in 60 or 120hz. Lifespan of approximately 60,000 hours. With the sizes you are looking at they commonly come in 40 and 46, although LG and some off brands also offer a 42 and 47.
LED – Same as LCD but with LED backlighting. Most are matte non-glossy finish, but some Sony and all Samsung have glare. Brightest picture. Come in 60, 120, or 240hz. Average lifespan of 100,000 hours. Offered in the same sizes as LCD.
Plasma – Glass over the panel gives it a glossy finish. Has the deepest, most natural-looking picture. All plasmas are 600hz. Average lifespan of 60,000 hours. Comes in the sizes of 42 or 50, although Samsung is weird and makes it in 43 and 51.
As far as coloring goes, it’s really a personal opinion. Experts and salespersons typically prefer plasma because we want the most natural picture, but customers tend to be drawn towards LED – it has a very bright picture that looks great in a retail environment, but keep your room in mind – the brighter the room, the brighter your picture should be. So an LED is great for a bright room, and plasma tends to be best in a basement. For the refresh rate (the numbers ranked hz), the higher it is the smoother motion (sports, action movies, etc), will look on the TV.
I own a Panasonic 50GT30.