There is another reason some people prefer vinyl, which is that they often used a different master than later releases. The medium, be it AAC, vinyl or CD really doesn't matter as much as what master has been used. There are CD pressings that don't sound as good as the vinyl, because they used a different master tape. A lot of this was the result of the loudness wars and the resulting reduced dynamic range, or even downright clipping (eg RHCP).

Some albums you cannot get digitally with the best sounding master version.