It is a manga, but I've not read it, I just own the anime.
And I, vaguely, knew about the live-action movie. Don't actually know anything about it, though.
And as for what Mushi I like the best...hard to say. Drawings coming to life would be worse than useless for me, my dreams are all wonderfully pedestrian (when I can remember them at all) so I doubt I'd notice a difference (

), Message Cocoons are useful, but cell phones do much the same thing, the Reincarnation, well, wasn't. The ability to see the past and future might be useful, but I'm not sure.
Really, I don't think I'd want any of them. They seem to be more trouble than they're worth, even in the best cases.