Sorry, I took so long to respond. I use a TCL 43" 4K television. I bought it at sams club for $215, but the same TV is sold at Walmart, Best Buy and various other stores with slightly different model numbers. Most TV are crap when used as monitors because of chroma and how it displays text. This model of television can display 4K@60hz@4:4:4 chroma, which means the text looks sharp and readable. Make sure your graphics can output 4K@60hz@4:4:4 chroma. My work laptop (Dell Precision 7710 with Quadro M3000 graphics) can only do 4K@30hz@4:4:4 but it looks and works great despite only 30hz. My workstation has a Nvidia GTX 980 and has no problem displaying 4K@60hz@4:4:4. I cannot tell the difference between the display between both machines. Its worth repeating that the 4:4:4 chroma is the key to clear legible text that you would expect on any normal PC monitor. If you cannot achieve 4:4:4 chroma, the text is very distracting and unusable in my opinion, but I spend my day in email, writing user stories for software development, Excel/Notepad++/data processing/manipulation, etc.
I do not have special software to split up my screen, I use Windows/Debian OS application window resize snapping to snap my individual applications either in quadrants or half screens depending on my current workflow. Windows easily natively snaps to quadrants or half screens. Debian/Ubuntu snaps to half screens, and I have to manually resize application windows to quadrants, but it works fine and remembers size/positon.
I like the larger size because I frequently need to work on three/four 1080p information screens in concert to get a task done and its much easier than flipping between multiple windows in a serial fashion. I consume text information on the screen and overall pixel pitch is critical to me to balance the amount of information/text I can have on the screen (as much as possible) with the size of that text, in that it neds to be large enough for me to read. For my work, 37" to 43" 4K display is perfect, 40" probably being ideal. 40" 4K monitor = four 20" 1080P monitors "glued" together.
My last point is that a purpose built 4K desktop computer monitor will do all of this better, but will come at a much higher cost. Think of this as a poor mans large 4K display that actually looks pretty darn good and works very well. If my TV/Monitor died today and I was forced to buy a new TV/monitor, I would most likely buy the same one again.
reference for those that want to try this:
Read this first:
The 6 Best 4k TVs For PC Monitors - Summer 2020: Reviews
Video to learn how to setup this particular Televison for optimum PC/Text use :