It would be interesting to hear which screens is the worst for everyone. Maybe that information can lead to something good for all of us!
After three years of cover-one-eye-training I can handle all screens, and I use a lot of OLED screens nowadays. No tension, but tired eye muscles in the evenings.
One thing is a bit weird. Some months ago I tested some old iPhones 4/4S and iPads (3rd generation 2012), I just started them up and could feel tension headache after a minute. I have tested them a couple of times since that with the same result. The only different from when I used them some years ago is that they have a newer iOS now. As a comparison I use a iPhone 13 Pro with the latest iOS a couple of hours everyday without tension.