I was going to say Bad era.
He was on tour for a large portion of 1987 and 1988. As well as making Moonwalker. Writing Moonwalk?
Then there were music videos left and right for Bad, The Way You Make Me Feel, Smooth Criminal, Dirty Diana, Liberian Girl and Leave Me Alone. These werent just small quickly throw together music videos either, these were all masterpieces with tons of work and effort gone into them.
I would have to give it to Bad Era.
Not to mention actually writing and producing the songs for Bad. I could be wrong saying this, but he wrote the most songs for Bad than any other album???