My XFCE story
I've used Mint Mate and Cinnamon briefly on a changing assortment of old Thinkpads, from T40 on to T410's. One of the last installs had issues with some program features not running properly, possibly after hibernating. Because I use Pale Moon as a browser and it's not in the Mint repositories I decided to try a distro that did have it, thus MX Linux. It's on a T400, it's fast, it does not use Systemd, (it has it for those programs that need it) and all my regular programs work. The only exception is Pale Moon which needs to be shut down and restarted when I hibernate. And it does that quickly. MX Linux has brought me to XFCE. I'm very happy.