I feel like it used to be size, color, and clarity meant more expensive. Now I look at a 500$ 4k TV and a 2000$ 4k TV and I don’t know what the difference is. They can both be smart TVs, be the same size, and have a lot of same advertised features, but what are the subtle unspoken mysteries that justify a huge price gap?
Aside from excellent color on OLED tvs, in a brightly light room (sunlit), you can’t really tell. However, in a dark room you’d have to be blind not to instantly notice how much better OLED looks due to the inky blacks which makes the colors pop. A properly calibrated LED tv is still going to look washed out in comparison. Even my neophyte wife thinks our theater OLED tv looks a lot better than our daily use LED tv and they’re in different areas of the house.
Saying that, I would never buy current OLED tvs for a brightly lit room as they aren’t bright enough to overcome the sun. That’s where LED tvs shine (pun intended).