Dude some of his later work is his absolute best work hands down.
Most people typically associate with his early work, but I would say his later output is probably just as prolific if not more so. He defined music in the 70's and the 80's, but by the mid to late 90's he was ignoring what literally everyone else was doing and just doing what he wanted to do. Most significantly with albums like Heathen and Blackstar he made music that can't be described even as being rock, or conventional in any way. In particular in Blackstar.
Admittedly as much as I wanted to like The Next Day, it just doesn't do it for me. There are some cool ideas there, but it's like the plain Jane for me personally when looking at what had come immediately before and after it. Heathen and Reality are two of my favorites, and Blackstar is probably going to go down in my book as one of the most brilliant and growingly so albums I've ever listened to.