I recommend OLED with dolby vision and hdr for anyone looking for a 4K tv. If you are trying to be future proof, then buy a display that has also supports the new HDR 10+ format.
Anything that you buy will be obsolete the moment you leave the store with it, so I recommend buying something that has features that will keep you satisfied for at least the next 2 years.
I upgraded top of the year to a 65" LG OLED 4K with dolby vision, hdr, and dolby atmos from an older 4K LCD . The difference in the OLED display is miles beyond my older 4K LCD. There is no banding and the true blacks in dolby vision are incredible.
The LG OLED 4K was so good that I built a Dolby Atmos 5.1.4 home theater around it with in-ceiling Atmos Speakers. I'm running Hi-Res Audio Polks throughout out and an SVS subwoofer. Eveything runs through the Onkyo TX-RZ920 including the 4K BluRay Dolby Vision Blu Ray Player.