My go-to has been NixOS for a long time, and I recommend it to all of my technical friends for server use. (Desktop use is also good but perhaps requires more commitment.)
For conventional distros, I have loved openSUSE for a long time. The package manager is flexible and easy to use, there are nice GUI configurators for systemwide settings, the KDE implementation is very polished, and the rolling release is stable. People in my life who are technical and smart but not particularly interested in Linux as a hobby have done well with openSUSE Tumbleweed in the past.