ALL OF THEM!!!
I can't choose.. I love in the same way "Human nature" and "Speechless"!! both are amazing.. and I can't say that I love more one than another..
It's him.. in all of them; and every song from each era has something unique, a part of him is there.. sometimes he's so sweet, sometimes so deep..and we can feel him in all of them.
His love, his passion, his angry, his sadness.. through all the years..
When you say "new songs" do you mean the ones which are going to be relased (after his death/now) or the ones which were released later than Thriller/Bad/etc.?
I love all the songs Michael has left us in the state in which he was alive. Shall it be from the Thriller or Invincible album sessions. The man is more than ingenius! No idea about the upcomming songs. They weren't finished by him. You don't see his insipiration anymore..