how do you propose that the digital file is modified to provide that change in sound? --Jerry
First, depends on what version of the master is being offered. The two services may not be using the same master or remaster as the source.
Second, by what method or tech are the albums being digitized. Qobuz clearly states everything on their site is a bit accurate transfer from the source. I don't know about Tidal.
Both playback without any harshness or glare, but I've found Qobuz to sound better in a head to head comparison of tracks.