If I buy a reissue, it's to acquire a recording I didn't have in my collection or to replace one that was damaged through the years.
That said, I did get one of the early reissues of the RCA Reiner "Scheherazade" a few years ago. A friend had an original 1S and a 5S pressing. We compared them and felt that the reissue was cleaner and more detailed than the original. The difference was not subtle His 5S sounded better than his 1S. This example is the exception rather than the rule in my limited experience.
I also have a couple of original EMI City of Birmingham "Le Cid" that easily outperform the Klavier reissue. I had the Klavier first and was gifted the originals.
That said, I did get one of the early reissues of the RCA Reiner "Scheherazade" a few years ago. A friend had an original 1S and a 5S pressing. We compared them and felt that the reissue was cleaner and more detailed than the original. The difference was not subtle His 5S sounded better than his 1S. This example is the exception rather than the rule in my limited experience.
I also have a couple of original EMI City of Birmingham "Le Cid" that easily outperform the Klavier reissue. I had the Klavier first and was gifted the originals.