Is it Scary, Money. During HIStory sessions he was on fire. I wish we heard more of what he wrote after the trial - I remember Brad Buxer said it affected his creative life in the same positive way.
Be Not Always is also a very profound piece, even though he wrote it at a young age. Also Will You Be There and Shout.
I wish there was more clarity as to what lyrics were written by him, and what was written by producers. He seemed to write lyrics quickly at the last monent, never giving it much attention, so when I tried to ask Brad Sundberg about the origins of lyrics to some songs, he couldn't even remember. They were always focused on music arrangements. It's unfortunate because I think lyrics are important.
But it's known, for example, that most of Invincible album was written not by Michael.