Now: Streaming
In the past: CDs
In the long past: cassettes
I would never get rid of any of the latter two - they hold far too much sentimental value.
I once joked with a friend that i wanted to catalogue my CD collection in personal purchase chronology - similar to the chap whose name evades me in High Fidelity) but it proved far too difficult. I do maintain my full collection in alphabetical ordered by release date for all my CDs. That was such a fun weekend doing that.
I think the saddest thing about the evolution of music is the erosion of the value of a physical copy of a cd, and the impact that this has had on the artist. I love having a physical format in my hands - I always have - and I always will. To me, it is the utmost respect for a musician or band pouring over their lyrics, the making of photos, or the photos that form the production and overall piece of music. I don't think music will ever really be the same as it is there music on demand without the need to even leave your room. Its great that you can do that now. But at what cost? I remember cycling to the local record shop on the day of release of Panteras Far Beyond Driven - I was 13 at the time. What a day. I was so excited - the anticipation there, and the anticipation back. Unwrapping the disc and popping in the album, and seeing the length pop up - you can't beat it. That first crushing guitar.
One thing i regret is not having my old hifi setup - streaming services are great but you cant beat popping a cd in and just listening - without distraction.
Dont get me wrong, streaming services overall are fantastic, as it opens you up to music that you just would never otherwise hear and to be fair, the algorithms are on point unless you let someone at your streaming account for more than 10 minutes!
More recently i have branched into vinyl - this is actually now more out of respect for the artists as it seems now that is the only place that any of the smaller bands out there can make any money.