Maybe worth mentioning is the soundtrack that I bought the most often.
The soundtrack (and even the recording, regardless of any genre) I bought most often is SUPERMAN – THE MOVIE. I do have the original WB Double LP, then the Warner CD of that (minus two tracks, which at that time had to be dropped to accommodate a single disc CD release), then the Rhino 2CD release, then the FSM “Blue Box”, and then, last but not least, the La-La Land 40th Anniversary 3CD release.
Plus I also have the John Debney recording with the Royal Scottish National Orchestra (though that’s a different recording, that’s more like in classical music, when you have several “Eroicas”).