Neither. CDs are only useful as a digital copy and 700MB is a quick download, and many discs can fit as FLAC on a microSD the size of my pinky nail. It might even be cheaper nowadays for them to mass produce 512 MB micro SD cards to put FLAC albums on them. If anybody wanted physical albums. It would be hilarious to just have a QR code on a tiny cardboard envelope.

If we want analog music, which is a cool idea, we should replace vinyl with something better. We can still use an optical laser disc but encoding stereo audio tracks as analog laser etches rather than zeros and ones. That way we could reduce the cost, and increase the quality at the same time. Might even be able to print them on glass for longevity. Then you might have an audiophile quality LP that doesn’t need to be flipped. Also in terms of longevity - an analog laser recording could be reverse engineered and listened to after the apocalypse, while binary CD format is a bit more opaque.