Motorola makes the best flip phone designs. The Razr 5G is the nicest foldable clamshell design I’ve seen. Samsung Galaxy Z Flip series surpasses it because of specs and features like Flex mode.
I do believe Oppo made the best design for the foldable book form factor. Find N is a much better design than the Fold 3. Specs match up close enough. I actually play a lot of my games in 4:3 aspect ratio. So playing GameCube games would be perfect for a Find N when opened. Many old TV shows are also 4:3.