Both can sound equally excellent. To me the main difference is there’s obviously near unlimited music thru streaming and tons of hi-res recordings you can’t get by spinning a silver disc.
Music through streamer vs CD/SACD
I wonder what method is used by the platforms to upload music to the cloud, I imagine something simple like a digital ripper or hard drive on a PC. For this reason, I consider it useless to rate the sound quality if you have high-end equipment. I think that listening to an SACD on a +$15k player to compare with a streamer of the same price range, there will be a noticeable difference. What do the experts here think?