I have been back and forth subscribing to either Qobuz or Tidal. Now, I have current subscriptions to both and have their libraries aggregated in Roon. Like others here have said, both services largely have overlapping libraries, but I believe it's worth having both services for the larger library.
I have Qobuz set has the preferred streaming service in Roon. But, Tidal does have a larger library. I use Soundiiz to auto-sync my favorite 50 Spotify playlists to Tidal. Those saved playlists show up in the playlists section in Roon. It's involved, but this is my system to get Spotify levels of curation but with higher quality files.
When I've tried syncing Spotify playlists to both Tidal and Qobuz, Tidal might have 98-99% of the songs in the playlist while Qobuz would often only have 80-95% of songs, depending on the genre of the playlist. I bet some of this loss is due to Soundiiz's inability to index music from all of these services, but much of the loss is because the music isn't present on Qobuz. Either way, I want the easy button. Although Spotify is miles ahead in its content mapping, crunching data from the listing habits of much of the world's population, I've found that after favoriting over 1000 songs in Roon that Roon's song suggestions have improved for me.