Kind of like the "digital vs. vinyl" discussion in another thread, it doesn't have to be either/or. I have both Tidal and Qobuz (and Spotify and Pandora too). From a pure sound quality standpoint, I prefer Qobuz. I also dislike the idea of having to buy specific hardware to get the "best" quality. Tidal has a bigger selection and there are some things about its interface I like better than Qobuz, like the "My Mix" selections.
Both Tidal and Qobuz sound really good even at CD quality and both MQA and Hi Res sound great. MQA content sounds great even with my non-MQA DACs.
I doubt that I could tell which was which if you were to blindfold me.
It's a lot like my other hobby - photography. People get caught up in brand wars, debates about file formats (RAW vs. JPG), and more. At the end of the day, I don't think there's a photographer out there that could look at an image and say what camera it was made with or if it was processed in RAW or as a JPG.