Ubuntu have official daily's of Linux kernel. Its popular. AMD/Nvidia proprietary drivers target Ubuntu specifically. There are already ppa's for X.org/Mesa test builds. Steambox will use it. All the OEM Linux stuff circle around Ubuntu. (And most probably PTS corporate users require good Ubu support)
Ubuntu is quite good choice for testing desktop Linux performance. (And Linux stand there for kernel, not userland :P)
And Ubuntu is the distro that is most likely to be first Linux desktop distro anyone new will use.
I use Fedora specifically because of Fedora's graphics stack, BTW. So I would have a preference in that direction, but any Linux that actually wants to be a Linux is just fine.
I'll give you an example: http://www.phoronix.com/scan.php?pag...tem&px=MTQxNTc
Canonical submitted 15 patches to Mesa for Mir.
WHEN HAS CANONICAL EVER PUT FORTH PATCHES FOR MESA OR XORG OR ANY OTHER PROJECT?!?! WTF!
Now sure, I'm confident that one patch happened 4 years ago blah blah blah, so what? Canonical is notoriously uninterested in being an upstream partner like Redhat, Arch, Mint, Debian, Gentoo, and (I do honestly mean to name every one of them but I know I'll make the post unreadable). But you get the point.
Now that it suits Canonical they submit patches? WTF. They're leeches. They're parasites.
They so rarely contribute back to the projects that they take advantage of, that it was actually a headliner:
And here's how it opens:
While Canonical is known -- and commonly criticized -- for not investing in making heavy, low-level upstream Linux contributions,
Canonical so rarely ever contributes back to upstream, that it's newsworthy items here at Phoronix whenever it does happen.
It's "man bites dog" for them to contribute. The normal "dog bites man" story is this: Yet another day, and *buntu still doesn't contribute.
Take, take, take, take, take, take, take, take, take, take, take, take, take, take, take, take, take, take.