Do both. Spotify to gain access, buying it to maintain access in perpetuity. I have about 60 or so vinyl albums that I would like my kids to hear in 10 years or so, and I’m hopeful they’ll say hey vinyl, cool (it won’t happen). But at the end of the day, I’ve picked out a number of albums that I want to carry into the future with me, and some of those I discovered through my Spotify subscription.