Why is that? (I currently use Spotify Premium with PiCore Player, thought about upgrading to Tidal)
Lots of reasons. Mostly how new stuff is presented to you. On Spotify you get the weekly new stuff and it makes that weekly playlist based on you listening.
Tidal keeps the same crappy HOT 98 style pop at the top all the time. I'm not sure what needs to be done to get in the "new" album section but its very biased.
Beyonce's new album was at the top of the "new" section for a year. I find stumbling into new to me cool shit less likely in Tidal. With Spotify I was finding new stuff contently.
MVHO YMMV