It certainly depends on the hardware you’re using to drive that pixel count, but a 21:9 or even better, a 32:9 display at either 1440p or 4K equivalent supplemented by a good 1080p (or better if you can afford it) secondary monitor is pretty much perfect. Bonus points for a vertical mount.
I currently run two 3440x1440 curved screens but will hopefully be selling them and switching to the above setup.