XFCE customization options
XFCE as a primary / 1st class desktop environment
pacman speed (vs dnf's glacial repo updates)
repositories - Packages are seemingly universally more up to date than Ubuntu / Debian based distros. It is nice to not have to turn to flatpak and snap for non out of date software. It is likewise not as bleeding edge as Fedora can be, though that was rarely something that caused me issues (I would say that aspect of Fedora is overstated, though there are a lot of updates frequently).
It does not write code for me.
None of my friends are impressed when I name drop Manjaro.