Tbh I think the microsoft neo (or was it the duo?) was the "best" - have 2 (or more) screens but put them on a hinge. You can get one big screen with whatever panel quality you like (hell, make it a cheap or transflective if you want), or you get a smaller screen if you wish.

There's a reason the Asus Duo is so much cheaper than the ThinkPad Fold X1 and all other OLED "folding" screen devices.