I work with the team that makes another blogging app, and at least from the standpoint of the quality of the code and application design, Habari is inarguably better [than WordPress]. As Sean notes, though, it's not very mature, so the user experience for a non-technical user would likely be worse. Where you'd make the tradeoff of whether it's worth it depends on where you reside on the continuum from programmer to non-programmer. Some of the technical things I love about Movable Type (which I use) include support for database abstraction, support for multiple blogs, and a well-designed infrastructure for things like templating -- Habari does all of those things very well for a young application as well.