The openSUSE rolling release is super Stable tooI think the reasoning on relevance to readers is a bit off. It might well be that Ubuntu is the "most popular" distribution, that applies however largely to the non-tech guys/girls.
Now, many of my friends/family use Ubuntu, but none of them knows anything about Phoronix.com. They simply don't care about all that tech stuff or some new version of Wayland. Contrary, I don't use Ubuntu at all and I do read Phoronix.com regularly, mainly because of the tech stuff and new version announcements of Wayland. Also nobody I know who reads Phoronix.com uses Ubuntu, most popular here is openSUSE, Fedora and Arch Linux.
@Michael: openSUSE has a kernel-of-the-day , besides many other repositories that follow closely the upstream development. Besides, the openSUSE build services  is just an excellent tool and by far better than anything Ubuntu/Canonical offers.
Now, I agree openSUSE has not always been the sleekest or most user-friendly distribution (one can see the huge influence of the German engineers trying to solve every problem perfectly ), but it has gotten lately much better with the 12.x releases!
Long story short: Use openSUSE, it's just the best.