HDMI ARC or Optical out ?

@saki70  The quality of both cable types plays a role. If you go Optical, then go glass.

I've had good results with both. There are so many variables that it will come down to your trying each one out to hear which you prefer for sound quality.

One difference that may factor in...are possible handshake issues with HDMI ARC / eARC. Sometimes (source and receiver dependant) there are issues.

All the best.

@saki70   The DH Labs HDMI 2.0B Silver is a solid value and performer.