I just watched a couple of YouTube videos about the MacOS 4k scaling factor and you're right, it's a bit confusing. Anyway, I just ordered an LG 32U880 4k monitor today, and will be delivered tomorrow, so excited!😀 Even though my preference is 27" but from what I read and learned from several blogs almost all conclude that:
What Is the Difference Between 32 vs 27 Monitor?
The main difference between 32 and 27-inch monitors is that most 32-inch monitors work well with the macOS while 27-inch monitors tend to shine on computers with the Windows OS. Also, 32-inch monitors are great for multitasking while 27-inch monitors are ideal for multiple setups. Source: 27 vs 32 Monitor: Which Monitor Is the Right One for You?
I just hope my desk space could accommodate the 32" monitor.🤔