I prefer to buy original releases of CDs second hand on Discogs. I then digitize them with Exact Audio Copy.

I never bought into the recent vinyl hype. Though I really like the beautiful design of many new vinyl releases, I don't think they are for being played. But I used to buy new and used vinyl as a teenager to actually listen to them, and occasionally I still buy used vinyl. Vinyl records from the flea market were as cheap as 1€, so that was an efficient way to grow my music collection before file sharing was a thing.

But now I prefer CDs because what really interests me is the music itself and I simply prefer the version with the best mastering. That's often CD releases from the early 1980s to mid 1990s.

And yes, I still buy music because I don't trust music streaming to be around forever. At least I think there is a real chance CDs will outlast individual services for sure. And in case the internet gets shut down because of war, at least I still have music as long as I have power.