Screen sleep/turn off in game mode. Would like it to turn off when I set it down or when downloading games in game mode.

Touch pads/touch screen improvements makes the device feel much more modern.

Cooling/fan noise is way improved. It is quiet and does not get hot like the LCD model. I leave the updated fan curve setting off to keep things as cool as possible.

Wifi is greatly improved, went from 30-40 Mbps download in steam to 100 Mbps on the OLED. No other wifi changes in my environment.

Faster charging/battery life. Literally no battery anxiety. Went from 2-3 hours to 4-5 hours running my primary game at 30 fps.

Analog sticks primarily but all the buttons just feel nicer and higher quality.

Emudeck has been amazing, so much easier then the android setup I had before. Highly recommend, a little harder on the customization but the out of box setting are solid.