Was thinking of getting two of these for my setup and maybe an ultra wide wouldn't fit but is an ultra wide worth having instead two monitors?
For gaming absolutely, dual monitors doesn't work too well for gaming due to bezels right in the middle of your view.
But if you want your game on 1 screen and discord etc on another then dual screen maybe better
For productivity, it depends on the ultrawide, a 21:9 ultrawide isn't as big as 2x 16:9 displays of the same pixel height (it's about 33% bigger than a single one), however, the 49" super ultrawides (5120x1440) are identical to dual 2560x1440 side by side, just without the bezels.
Of course to run a 49" at fullscreen is going to essentially half your performance, since it is double the pixels, and also means you will need to move your head to see the edges rather than just your eyes... Sadly there's a trade-off whichever you go for
A 3080 may struggle to hit high FPS in AAA games at 5120x1440, but should be spot on for 3440x1440
Only problem with ultrawide is, once you've used one, you'll never want to use a 16:9 again