Single AOC 27" UHD monitor on my desktop Windows system at home. I use multiple desktops for context switching. No gaming, just a bit of dev and photo stuff.

At work, a couple of Dell 27" UHD monitors attached to my Windows laptop via DP ports on a dock. Single desktop as I have plenty of screen space. I mostly live in Visual Studio and Outlook/Teams.

No complaints about either - all works pretty well.