You can also use apt-pinning to set priority for which release to use.
A long time ago I ran stable, and pinned testing at low priority.
Across the decades I've slowly upgraded my stance. Now my machines run Debian Unstable, with testing and experimental pinned at very low priorities. Unstable does sometimes have unsatisfiable dependencies, so it's good to have some other options. And sometimes I just want what's coming for a specific package or kernel, and experimental will often be there.
A long time ago I ran stable, and pinned testing at low priority.
Across the decades I've slowly upgraded my stance. Now my machines run Debian Unstable, with testing and experimental pinned at very low priorities. Unstable does sometimes have unsatisfiable dependencies, so it's good to have some other options. And sometimes I just want what's coming for a specific package or kernel, and experimental will often be there.
https://jaqque.sbih.org/kplug/apt-pinning.html