What's your favorite Madonna album and why?

Mine is "Ray of Light" from 1998. It's her best work because it's essentially her most mature, sensual, and spiritual work to date. It has more depth than her late-80's/early-to-mid-90's albums which she hasn't been able to replicate since. Her albums after 1998 (like 2000's "Music", 2003's "American Life", 2005's "Confessions on a Dancefloor") had some depth too, but not on the same level as "Ray of Light". Don't get me started on Hard Candy/MDNA/Rebel Heart, those albums are ******* terrible!