Unstable aka Sid receives updates always, I think your thinking of Testing which goes into a freeze period before each major release of Debian. Sid has been qu

Unstable aka Sid receives updates always, I think your thinking of Testing which goes into a freeze period before each major release of Debian. Sid has been quite stable for me, the packages are much newer than Ubuntu (generally on par with Arch or close to it) and the few noteworthy bugs I have seen over the years have been reported and handled within 24 to 48hrs of said package being updated with the problematic code.