Toslink VS coax VS other forms of Digital transfer


I am new to this forum and relatively new to digital audio in its present forms… My question, is there a "better way" from a technical or sonic view to connect devices to my new DAC?  

I have a Sonos connect unit which I use as a tuner and Tidal source as well as a few music playlists. It has an optical output, coax and the usual RCA single ended… I am auditioning an AQ power cable that has improved the sound a bit..

Sonos makes for  a lot of access and convenience however, I have never found the sound quality to be satisfying… I am told that going into the DAC optically will improve on that to a point… Bluesound is supportive of higher res files and I am sure there are other units that may be better yet…  Any thoughts?
Thx Cj
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Showing 1 response by wjt3

How is that cd9 working for ya these days? I picking one up this week. Would like to know how you ended with cables ect--thanks