1 minute ago, Sahara874 said:
I also think I prefer Ultrawides, but I have not tried neither of the options.
The thing is a 27 inch 4k monitor is pretty much the same thing as a 2560x1440p 27 inch monitor.
They are "identical" because of how bad Windows is at scaling higher resolutions, you'll end up with the exact same virtual work space with the only benefit of a higher pixel density but not like you'll have your face stuck right in front of the monitor to take any advantage of it.
While a 3440x1440p monitor will have pretty much the same clean image but 21:9 aspect ratio will give you a lot more of true virtual space to work on.