So. To recap. In the time it took the closed and secretive XHTML working group to release a new version of this specification which did not fix one of its simplest problems despite that problem being reported multiple times, the open and transparent WHAT working group wrote an entire HTML specification, more detailed than any previous such effort, and fixed the problem in the process.
Even if HTML5 didn’t actually add something new or fix any problems beyond just making a better specification (and boy, HTML5 does all three of those), the HTML5 effort has still been way more productive, way more conductive of actual web usage and produced a way better specification than the same W3C who somehow managed to get most current HTML specifications (except for ISO HTML) out the door.
Vote HTML5. Because it’s not about XML or strict rendering or making the perfect markup language, it’s about getting things done, picking up emerging semi-standards and extending what we have in a way that makes sense.