I tried Ubuntu several years ago, and really didn't think it lived up to all of the hype. I encountered a lot of obvious bugs (perhaps because I was using the 64-bit version, which was probably somewhat unusual at the time) and the admin tools seemed weak. Add to that some of the weird stuff that Canonical has been doing lately (privacy issues around their desktop search, Unity, Mir), and I'm just not too eager to go in the Ubuntu direction. If I hadn't gotten OpenSUSE 12.3 (mostly) working, Ubuntu would have been my next step.