I did a 55" 8k for a bit but that was too physically big so looking at the edges was weird. 43" is probably a lot better in that regard but for me that turned me off single large displays instead of arrays.

In the end I ended up with 6 displays in a 3x2 arrangement: 3x 1440p + 1x 4k on the primary PC and 1x 1440p + 1x 4k on the secondary PC and then I used Input Director so it feels like all 6 are one big computer when using the keyboard/mouse (used to use Mouse Without Borders but Input Director is far superior these days). I like this setup more because it gives me a larger primary monitor on each computer to work off of but leaves me separate monitors to put secondary things on. This comes with the bonus that fullscreen doesn't mean "and everything else must be gone" yet I still have the bigger primary display to fullscreen with.

General note I've fallen in love with https://www.amazon.com/gp/product/B082845XM8/ as it's simple, cheap, and extremely sturdy.