mono-stereo two version, learn to read. Neither is reference quality, but I have mainly watched the 4K-version that’s too dark (literally, not content-wise).
I also have three different copies of Blade Runner. The DVD has the making of doc in the best quality (dunno why it looks worse on Blu ray), the 30th anniversary Blu ray I bought to watch the 1992 Director’s Cut in HD for nostalgia-reasons (that’s the version I watched in the 90s/ early 2000s), and the 4K Blu ray has the 2007 Final Cut in 4K with Dolby Atmos-sound and is the best version of the movie really. Revisionist or not.
I don’t own multiple copies of any other movie besides those two.