First, I know Groove streaming is gone, but Groove as a player certainly is not "dead and buried," that's just bad reporting.
And I miss Groove.
But we march forward, so
1) Deezer: Presently, out of the blue, I use Deezer most of the time, just to stream. It's premium service is free from my mobile provider, meaning it doesn't not consume data nor have a monthly fee, very nice. Their Flow feature "learns" me, by my thumbs up and downs. Its really good. Can't beat free either.
2) Groove: like other people here, I still stream my huge personal collection via Groove from OneDrive. Wonderful.
3) Spotify: in the past, before Groove took off, I loved Spotify. Now, I don't. Most likely, I'll drop it. Better options elsewhere.
4) Amazon Music: It's in trial for me. So far, it's so-so. I have Amazon Prime, so I get the (limited) free streaming. And I'm toying with an Amazon Echo, which for $4 bucks a month I get the Full Amazon catalog. It does not have radios that learn me like Deezer Flow. Only play lists that are so-so. So, I'm on the fence.
5) buying: I rarely bought in the past, and only for tracks I could not stream or buy via Groove, which was rare. And when I did, I bought from Amazon, MP3, and put it in OneDrive and streamed it from Groove. In theory that will continue.
One other thought, I really miss having everything in one app like Groove. So I contemplate, and might test, moving my personal collection from OneDrive to Amazon so I can stream their music and mine from one app. I faintly recall that Amazon music storage might be limited or expensive, so it will take some study, including if the can play the Microsoft WMA format (or whatever it was called). Spotify won't.
Thoughts on that last point anyone?