Prior to Lubuntu, Xubuntu was the go-to version of Ubuntu for people in need of a lighter desktop. Xubuntu remains a good alternative option if you’re using an older PC. You may also prefer Xubuntu if you aren’t a fan of the animations and design conventions found in many other desktops.
Xubuntu uses the Xfce desktop environment. Xfce utilizes many of the same apps and components found in GNOME, but with less overhead.
Xfce is one of the older interfaces available for Linux, so you can expect a mature and stable experience.