I have always been discovering new things about Linux distros while distro hopping. And when I get something I really like, I just copy the package name and make sure I install it in every distro I use in the future.
Let me start:
- Clipboard manager (Gpaste)
- KDE connect
I would say AUR access with either Xfce or MATE as a default and first-class option for DEs. It’s hard to go to a distro without AUR access for a lot of what I use, doable, but hard.