Keep in mind that I still think 5:4 is the best and have used it for many years.
Two 16:10 screens mounted vertically side to side?
I would get an ultrawide screen only if it was high enough and slightly curved. Curved screens make sense for single-user desktop computer use, they don't make sense for TV or cell phones.
If a screen is too wide, the sides would be weird if the screen is not curved. If a wide screen is not large enough, it is just vertically challenged, which is pitiful.