I used to be all in on multi screen until 4k became a real option.
I invested in a 32" 4k monitor in 2016 and it's been a game changer.
I can look at full screen engineering drawings, I can open specifications documents, occasional code. With snapping I often have my screen split and can quickly move windows or programs around. The best part no bezels so I can make things fractions like 2/3 unlike normal screens where it would span a bezel.
I ended up putting my spare on the ceiling where I can monitor things and test configurations.