Can I just say how happy I am with Xfce. It's a Linux desktop environment that looks like in the early 2000s. It's fast. There are no unnecessary frills. It just gets the job done. Its release cycles are measured in several years, and keep it minimal. I used to be on Windows, then macOS, then Ubuntu and now this. As a developer with soon to be 20 years of experience, it's the best environment I've had.
So was I until I switch to a 4k monitor and realize that there's no real, stable, functional fractional scaling on Linux, even less so on XFCE, unfortunately.
I also use 2 different resolutions without problems
KDE plasma gives you fractional scaling
I've heard Wayland supports different scalings on different monitors, but I'm on Xorg so I can't say if it works