>>106341247 (OP)
Using it right now. It's not the best, but I needed something that just works right out of the box, and it's doing the job.
I think XFCE is better in general as a lightweight DE, but it also requires a bit more than just changing the GTK theme and wallpaper to make me feel at home, so it's tedious. i3 is preferred to either one, but it's even more tedious.
Plasma is my preferred "modern" DE, but it's not lightweight and not as easy on RAM or battery as MATE (something I have to take into consideration with this machine).