Even with generous storage space, I can only justify keeping maybe one copy of the album in FLAC. And then it comes down to which version will I archive as FLAC

Even with generous storage space, I can only justify keeping maybe one copy of the album in FLAC. And then it comes down to which version will I archive as FLAC: the original pressing? The recent remaster? The "collector's edition"? The ridiculously hard-to-find Japanese SACD pressing?