Agreed. The ML one is much more organized and the design and experience are both incredibly better. It has more of a classroom and course feeling to it, rather than the AI class's here's some video lectures and quizzes, now do the tests.
The ML class also has a full-fledged Q&A forum (which has LaTeX markup support), which, to me, is a necessary component. The about page[0] lists Stanford students as developers (the first one is an undergraduate sophomore named Frank Chen), and the team is different than the guys behind Know Labs (from a quick search.)
Andrew Ng is an excellent teacher. Seriously, the ML class is the most fun I've had learning in a college course environment. That speaks volumes.