Stick with Apple Music until you make the big move. You are not going to notice the difference with a lower end streamers and even then it’s not going to be leap. Apple does offer hi res. You can spend up to $50k on a streamer and be able to play Apple Music. Very limited. It’s not always straight forward however and in many cases you will not be able play Hi Res. Over time more companies with be offering Air Play for they see there is a growing market. There are folks entering the HIFI but are going to stick with Apple Music for awhile.
Again, stick with Apple until you make the big move. On the other hand you could get Qobuz or Tidal now and start to build your play list over time. You get the best of both of options