I think that depends more on the administrator's knowledge. I've used Debian Testing for a little bit and I've never encountered a stability issue. With Gentoo, unless you read closely about the updates and apply them regularly, you won't have a stable system if you update blindly. Of course, I don't use Gentoo, so use some salt.Right now I'm using Gentoo. Uptime is 25 days. I only kill X from time to time to free some memory; same with Firefox. In my opinion Gentoo is more stable than Debian Testing, can't say about Stable.
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