Personally, I don't trust Ubuntu LTS releases until they get their first point release, and even then I'm skeptical since they're a bit more loose with package versions on stable. I do trust Debian when it first releases because they're far more rigorous in their testing, though I usually wait a week or two before doing a release upgrade just in case.
I used to really like Debian testing, but I've since moved to OpenSUSE because they have a real rolling release (for my desktop) and a solid release based version (for servers). I like Debian, but testing gets a bit sketchy around release time (frozen, and then a ton of updates), and I honestly don't trust Sid aside from pulling in the odd package. I don't trust Ubuntu at all, since it has caused me far too many problems in the past.