Mac vs streamer.

It depends on the execution. Either approach can deliver exceptional sound quality. If not done well, both will fall short.

The past few years have seen advances in software, addition of intermediate steps, and exceptional components at relatively low price points that "date" some of the posts above.

@m669326 Search for audio optimization tools for the operating system and device you are using.

Deezer offers tips to optimize Deezer. They are limited, but may be helpful if you have not applied them.

Here is very general (and basic) info from Deezer support.

https://support.deezer.com/hc/en-gb/articles/115003875089-Deezer-data-and-Smart-Cache

If you are open to digging deep, search 'optimizing Mac OS for DAW' (Digital Audio Workstation).  Be specific with your OS version.

Here is one search result:

https://www.sweetwater.com/sweetcare/articles/macos-10-15-catalina-optimization-guide-for-recording/

***Much, much easier to run Audirvana, JRiver, etc.***

Here is a partial list of other options:

https://alternativeto.net/software/audirvana-plus/?platform=mac&p=2