I'm no expert, but I can tell you what I think based off my experience.
I had a Sony 4K LED TV in my living room. My "main" gaming setup. I had my Series X/PS4 Pro on it. It's was a middle of the road model TV. Had a fantastic picture but only had the HDMI 2.0. Everything looked great and sharp. Honestly, no complaints, however, I was walking through Best Buy and an amazing TV picture caught my eye. It was an OLED. I'm a sucker for technology, so oh boy, here we go....................
After finding justification to the wife that we needed another new 4K TV (I made a deal with her. She wanted carpet. I wanted an OLED. See where this is going?
) I got the green light. I researched and researched. Kept finding myself coming back to the LG CX. I love Sony, wanted a Sony, but this LG had amazing reviews and was great bang for the buck. Bought it. I LOVE IT!! It has the HDMI 2.1 so I can get 120hz (if the game allows) and the picture is incredible. The colors are deeper, more crisp, and overall the picture just pops. I was worried going from 4K to 4K wouldn't make much difference, but it did and I don't regret this purchase even in the slightest. The
only downside to OLED, and I do probably overthink/worry about this, is that you can get burn in. The LG has technology baked into it that is supposed to fight it, however, the chance is still there. So far so good for me going 1 year in.
TL;DR Version: Buy an OLED. They are amazing.