Comment by simpaticoder
7 hours ago
I have both Blu-ray and DVDs and I've found its the content that determines which is good enough. Kids in care not one bit about image quality. Obviously: people still like retro games, too. But then other movies, like anything by Villenueve or Nolan, or Baraka, really want to be on 4K Blu-ray. But kids movies on DVD are perfectly fine, and sitcoms like Community. (Personally I'd pay extra to NOT see Pierce in 4k).
I recently purchased the Firefly Blu-ray and it was an interesting case because it's image quality isn't that much better than the DVD (but definitely better) however it's sound quality was astonishingly better than the DVD. I imagine this has a lot to do with the source material, how it was mastered, etc. I still stream, but I like that I have a core collection that will never disappear without warning, or be edited behind my back (which happens all the time, without notice, especially on YouTube and on Amazon Prime).
Yes, for older TV titles, the main reason to opt for Blu-ray is the better sound quality. Although DVD supports uncompressed audio (LPCM), that was rarely used outside Japan, and regular stereo audio typically used pretty mediocre compression.
When using subtitles, another reason is the higher-resolution fonts.