Streamer recommendations

Playback Designs MPS-X streamer and MPD-8 DAC. Both cannot be beat. 

I do not know your budget.  I highly recommend the Linn Klimax DSM streamer with Organik DAC and Utopik power supply.  It is amazing!

For less budget, the Linn Selekt Edition hub with single stereo or dual mono Organik DACs is also outstanding.

I also went from a BS Node (N130) to an Aurender, but I still have the Node and I happily listen to it in another system.

I recently got an Eversolo A8 streamer/DAC and really like it. Easy set up, supports Tidal, Qobuz, Spotify and others. Also can stream from USB devices or, an internal SSD up to 4tb (not included, user installed). Sounds great to me (I had tried the Cambridge Audio CX100 but sent it back as it was hard to use and sounded too bright for me). At $2k I felt the A8 is a good value. 

I never used dCS Mosaic but I can say that Aurender Conductor and Lumin app are completely different animals. Aurender provides a much better user experience than Lumin, it’s more user friendly and has better features. Lumin redesign is way overdue. It’s just not good.
My recommendation, based in my own experience, is to use a separate dedicated streamer.
Or if you want top notch UI/UX with dCS go with Roon but that in most cases comes with a slight sacrifice in sound quality…you need to test it and determine for yourself.