Assuming we compare the red book CD, vs stored file, versus streaming. Assuming the same quality of the equipment feeding the DAC, then they would be all the same.
However, Qobuz has over half a million albums of higher resolution. So, this is where you may have heard this.
As far as components… they all make a difference in the sound quality… so the better the streamer, the better the sound… just like the DAC, preamp… etc. to find an appropriate streamer, I would start by researching in the same price category as your DAC. Better streamers sound better. I have owned best of class streamers from $1K to $23K… and the latter is simply stunning and provides sound quality equal to my extremely good vinyl leg.