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Slacker has been free in the past and I assume still is. You get an automatic account you have little control over with the Tesla. Spotify you need a Spotify subscription.
I signed up for Spotify because it was cheap, like $20-30 / year. Just so I would have control over the library of stations you build up and you can listen on almost anything. They have 2 levels and I bought the cheapest level.
I had Spotify too it’s like $10/mo but I stopped it for now because I drive so little with COVID. And slacker is generally enough even though not as large a library or control. No replay at the cheap level.