I just upgraded from LCD to OLED. I would say the difference in battery is significant, and the blacks/colours are also very nice. Reduced screen bezels means that the oled is a slightly larger screen too.
I'm a person that played the LCD deck every day, and I would say these changes in the OLED are worth it for me.
Context: I've got a gaming PC with a 3070ti in it, that gets ignored most of the time now, and that was true when I only had the LCD deck.
Also has a bigger battery, so potentially longer playtime, even on those graphically lighter games. I'm glad I got the OLED for long travel, when I didn't necessarily have access to an outlet.
TIL Brotato