optical

Hi I got a Yamaha R-N600A receiver amp, and just bought a used Yamaha CD-S300 CD player/deck (don't have it yet) Both have optical connection. And I'm wondering if I should use it or not Which unit do you think has the best quality DAC? The R-N600A has "SABRE ES9080Q 384kHz/32-bit (ESS)" DAC...

I have read a lot about optical vs coaxial connections, when attaching a digital product to a DAC, so I decided to try it out, connecting both types to my Rega DAC (1. Gen). My setup Airport Express connected with Audioquest optical using Airplay 2. Squeezebox Touch connected with Wireworld...