I did some tests recently:
Samsung s10e, Samsung s10+, iPhone 11, Samsung A70, Huawei p10 lite, Huawei p9, Vivo Y70, Huawei Mate 20 Lite, Realme 6 Pro
All of them don't really work for me, but I Samsung s10e is clearly the best device I tried. It didn't get me any symptoms when using for a short time like checking some out or quick reply to messages.
Even though I couldn't use for hours I was thinking of not returing it, but it's quite small for me as I prefer bigger smartphones.
The second best phone was Samsung s10+, so it seems like Samsung S series work pretty well for me. It might be Dynamic Amoled which is known for eye-friendliness.
Some of you recommended Samsung A70, but it honestly gave me ones of the worst symptoms I have ever had. After a while my vision was so blurred that I was afraid of going anywhere out.
I find it incomprehensible that Huawei P9 didn't work since my only fully comfortable phone is Huawei P9 Lite with the same Android version.
E: I ordered Samsung Galaxy Note 10 as I tested it out in a store for 10 minutes and I felt quite well.