I have a Rock64 that runs LxQT.

I run KDE Plasma on my laptop. KDE animations are too bloated and heavy for the Rock64, and there's way too many preferences to fiddle with to disable them all. If there was some kind of global "lightweight mode" checkbox in the plasma prefs, I might give it another try.

LxQT is fine. The main gripe I have with it is there's no sort of LxQT-meta package on ArchLinux which installs everything I actually need without a lot of fiddling. I spent a couple weeks just gradually figuring out things were missing that would make the environment a lot better. It would be nice if it just included things like oxygen icons and whatever. I understand lightweight, but they should have an "opinionated" lightweight option since I just want something that runs well on a SBC.

I used to run XFCE on an arm chromebook for a few years as my daily driver. Between the two, XFCE seemed much easier to install/customize. IDK about now, since that was before the latest release which uses latest GTK. I assume it is less lightweight now as a result of that change.