That's a hard question to answer. But here is my attempt.
If I really want to do a deep dive listening session, my go to albums are Pink Floyd "Animals" and Dire Straits "Love Over Gold". I could listen to the song "Dogs" a thousand more times, and I still pick up sounds and notes in the background. Just a masterpiece album in my humble opinion -- biting commentary on 1970's England. To test out the dynamics of a system, nothing is better than "Telegraph Road" and "Private Investigations" by Dire Straits. Subtle classical guitar runs, distorted guitar chords, and a soundscape that goes from whisper quiet to "1812 Overture" level sonics.
For the third on the list, I've been listening to the amazing Mark Hollis a lot lately -- his solo album and his work with Talk Talk. Specifically, "It's My Life", "The Colour of Spring", and "The Spirit of Eden". Just a fantastic trio of releases. Such a shame (see what I did there LOL) that Talk Talk never hit it huge in the U.S. and the work of Hollis was under appreciated during his lifetime.