Daily driver here. Stable for servers, testing for workstations.

Debian Testing isn’t as stable as Stable, but has been far more reliable than anyone else’s desktop releases. I’m also not a fan of Fedora and others’ policy of ending support on the day of a new release.

If for some reason you decide to hold back on an upgrade of Testing, you’ve still got five years of patch support coming. And if I do want to live on the bleeding edge, there’s always Sid (also called Unstable). That’s where you’ll run into the kind of instability you can expect from a rolling release.

My favorite will probably always be Gentoo, but I don’t always have time for that hobby.