If the DACs and the rest of chain are equal , optical disc will have less digital jitter than ripped file playback of the same album
so playback of the CD /SACD will always sound better than streaming .
in a lot cases , people are comparing
optical disk playback on old internal DAC vs ripped file on new external DAC
if one has oppo 105 , the disc will sound better than the ripped file playback to the same oppo DAC (usb input )
Obviously , one needs a resolving sound system to hear the difference