Definitely Thriller. I'm definitely more of a Thriller/OTW type of person than a HIStory/Invincible type, say, unlike a lot of people on MJ fan boards in particular. I would have been quite happy for Michael to have continued in the Thriller style for the rest of his career, suitably 'updated' of course (or should I say, I suppose, MJ old schooler that I am!). I seem to have basically stopped listening to a lot of his post-Thriller, or at least post-Dangerous, stuff lately.