I've really enjoyed the Book of Basketball podcasts so far. The prologue he did was really interesting, because it was clear he was just reading a long-form piece that he had already written. The Kerr podcast was also really interesting, because as PC pointed out above, he is really candid about Durant and this is far from a BB/Pop interview. I think that is an example of a strength that Simmons has where he has really solid relationships with a lot of people, so they are more willing to be open to discussing controversial topics on his podcast.
I just finished the one on Shaq he recorded with JA Adande and it is fantastic. Just a thorough deep dive into a modern star's career, with enough hindsight having set in that I think they build a fair assessment of his career. I agree that Shaq is probably a bit underrated today, which is hard to believe given how famous he was and still is. I'm really looking forward to the future pods, presumably on Duncan, LeBron, Kobe, Durant, etc.