Some days, I think eventually there will be as many blogging tools as there are bloggers. But even that won't cause the endless debates about which tool is better to cease.
What I have always said still goes. Choose the one that does what you want or need to do the way that is most efficient or easiest or best-looking or whatever criteria you want to use. For me, that has long been Movable Type. Lately, though, I have been thoroughly exploring both WordPress and Textpattern.
Repeat after me: None of them is perfect. But each one does a lot of cool things. The trick is to choose the one that best fits the task at hand. And that most likely will not even be the same for each person.