@slaw Barrett is the place to start, in my option. The Madcap Laughs is EMI trying to fit him into a box and present as a traditional band - Barrett is a bit looser and follows Syd’s vision - whatever that may be at the time.
All are worth owning - and should be required listening IMO. A brilliant writer who maybe flew a bit too close to the sun. An acquired taste like @noromance said - maybe Tyrannosaurus Rex being the closest comparison.