The information you found is fine so far as it goes. When concerned with sound quality however you must always keep in mind that everything matters. Not just optical, not just HDMI, but everything- and the only way to know for sure is to listen and compare.
For example, you could find the sound is better with an ordinary RCA interconnect, in spite of the optical supposedly being better. This could be true either because the RCA interconnect is a lot better quality, OR because the RCA out actually sounds better, OR is just plain a better impedance match, able to drive your amps input stage better. OR it could just as easily be that what the internet says about optical is based purely on measurements (almost a dead certainty) and not anyone actually listening- and when you listen you actually prefer the other way around. Who knew? Nobody. Only way to know is to try and listen.
Sorry, but that's the way it works. You rely on advice from people who have and never will listen to your system, and you get the results you could expect from that. Might as well ask what tire pressures to run on your car, which wine to have with your rib eye.
For example, you could find the sound is better with an ordinary RCA interconnect, in spite of the optical supposedly being better. This could be true either because the RCA interconnect is a lot better quality, OR because the RCA out actually sounds better, OR is just plain a better impedance match, able to drive your amps input stage better. OR it could just as easily be that what the internet says about optical is based purely on measurements (almost a dead certainty) and not anyone actually listening- and when you listen you actually prefer the other way around. Who knew? Nobody. Only way to know is to try and listen.
Sorry, but that's the way it works. You rely on advice from people who have and never will listen to your system, and you get the results you could expect from that. Might as well ask what tire pressures to run on your car, which wine to have with your rib eye.