When you are nearing top of the line TVs, you should look at your room and your viewing habits as much as anything else.
OLED is king. This is not even open for discussion when it comes to raw image quality. It has excellent off axis viewing and black levels which no other format can touch. Pioneer Kuro owners have put their plasma displays up against OLED and OLED has (barely) come out on top.
LCD televisions are still just LCD televisions. They've gotten worlds better over the years, and in certain areas they really do a better job than what OLED can do.
Specifically, they can be brighter and they don't really suffer from burn-in potential.
Now, if you are a gamer, and this will be your main gaming display, and you expect to play for hours at a time with games that have the same menu bars on screen all the time, then I probably wouldn't get OLED. I would get a good LCD and call it a day. I would compare the best LCDs from Sony and Samsung if I were just going for the absolute best, no questions asked.
But, if I was playing video games not that often, and preferred great quality for movies, then I would opt for OLED. If was in a bright room where movie watching isn't king, but perhaps sports viewing was... I would go for a LCD.
In my family room, I had a plasma for years, but the room was really bright. I ended up swapping it for a LCD display. No question that the plasma had an image that was superior. But, the LCD is clearly brighter and really makes daytime viewing a good deal more enjoyable for everyone in the house. In the end, a good choice. Had I not had a plasma to begin with, I probably wouldn't have noticed the dip in image quality.