When you buy a TV, you have a few things to consider, some of which you may or may not realize.
#1 Budget!
#2 everything else.
But consider the following:
How bright is the room?
Viewing angle needs?
Screen size?
Color reproduction?
Gaming? TV viewing? Computer monitor?
For more movie watching in a medium to darker room, OLED is superior. It is going to cost you a little (or a lot) more, depending on what else you are considering. Perfect blacks, better off screen viewing angles, and the best overall image quality available as of now. I personally picked the LG 55" C8 OLED for all of the advantages, but I was close to picking the Samsung Q7FN as well. My TV should be here by this Monday.
For a brighter room, QLED is king. HDR especially will be great with the massive brightness advantage QLED will have compared to OLED. But smaller off-angle viewing, less uniform blacks and greys, and less overall picture quality will be the sacrifices. I would say the only QLED that gives OLED a run for it's money now is the expensive Samsung Q9FN, with a lot of advantages but still not as good overall picture quality as OLED.
For gaming and computer use, screen burn in can happen with OLED so you have to be more careful. QLED is superior in this regard, as there is 0 chance of image burn in. But OLED is often just as good as QLED for input lag and refresh rates. I will be using my C8 often as a computer monitor and game screen, but I will take all of the precautions and it would be better to not have to worry about it. That does not mean the C8 is not a great gaming/computer screen. It has the image quality and low input lag to make it excel for it. Just stinks having to worry about burn in.
For bigger screens, QLED is MUCH cheaper than OLED.
For seats not directly by the center of the screen, QLED picture quality degrades easily compared to OLED.
So as you can see, there are sacrifices and no "one screen for all" no matter what. I hope this helps and goodluck with your purchase. My C8 should be here any day now, still in transit with the shipping.
It should be mentioned that I still own a 1080p Panasonic Plasma and it was used as a monitor and gaming display and never had burn in or retention problems, still works like new as well. So think the burn in risks are not as big of a deal as long as you are responsible to prevent it.