Mx

MX Linux is a Debian fork that focuses on oldish computers. It uses sysV by default but allows to install systemD instead.

Default DE is XFCE but it has a KDE installer which has a good integration. At the time of writing, Wayland integration for KDE seems quite buggy, at least in dual screen view.

Also worth noting: MX Linux is BTRFS ready; snapper is easy to install& setup. This gives easy rollbacks.