Dittoes.
But “buy”? What does that mean? Once you are Amazon Prime - all your music is free.
You’ll need the extended music service though if you go the Prime route. The standard doesn’t have nearly as much music to sample.
I use and like Amazon streaming, But, the selection is volatile as the music comes and goes. Plus, streamed music is compressed to the point of it being far lower quality. I like to be able to load my music onto my iPod or play it without an internet connection.
So, I buy.