Jeremy Zawodny writes on the Future of WordPress and MovableType and writes:
‘WordPress will come to be the de-facto choice in the world of self-hosted personal weblogs and low-end webhosting “value added” package. MovableType will be the blogware of choice in the corporate blogging world, both for internal weblogs and those that face the outside world.’
I can’t say I’d made that distinction – I use both on very similar blogs and find they each have their own advantages. I’m probably leaning more towards WP at the moment – but could go either way.