I have got my OLED Steamdeck today and made a picture with my old one side by side. The display is a little bit bigger, the touch screen is way better (more like a smartphone).
I guess the problem is looking at your picture on my LCD smart phone. :)
I can tell the machine on the left is the OLED version because the screen is just a touch bigger.
Or maybe they’re only marginally different. I have an OLED screen on my phone, and there’s only a slight difference between them (one on the right is slightly duller, like the contrast is turned down a slight touch more).
I’m going to be getting the OLED version, but LCD tech has come pretty far, so I’m not surprised it’s still a viable contender.
The blacks seem a little blacker even when viewed on an LCD screen, I believe.