I opted for Lubuntu when I switched back to Linux after a ~15 year hiatus and I'm very pleased. It's really aimed at older/slower computers, but I think it offers the convenience of Ubuntu (easy installation, good online resources for help, large and well-maintained package repositories, fast security updates) without much of what old neckbeards like me dislike about Ubuntu proper. Lubuntu has saner defaults (IMHO), no massive desktop environment or office suites in the default install, is less dependent on Gnome apps, etc.

(Edit: I see now that Lubuntu 20.04 LTS comes with Libreoffice, whereas 18.04 did not.)