I'm new to the high quality audio and HiFi stuff. I came across good sound and the world of DACs and toys rather by accident. I bought a Scarlett Solo interface to plug my new Telecaster into my computer, and plugged that into a $100 pair of small studio monitors. The difference of stock audio was amazing. I've since added a bunch of toys.
The challenge I think, for Qobuz & Tidal's HiFi, is the abysmal state of everything else. Good audio on iOS is a mess, with Apple seemingly actively trying to limit audio quality to iTunes' level of trash. Android's hit or miss, depending on the device. Bluetooth, Airplay 2 and Chromecast have varying levels compatibility issues that make it difficult to get a system where everything works at its peak.
Qobuz sounds incredible on a DragonFly or other DAC connected to an adapter, with a $30 pair of BLON's, ($160 -$230 worth of stuff), but not nearly as great with a $300 pair of Beats, AirPods or Sony's. Sounds 10x better on a good DAC and amp over good speakers.
Amazon really only supports the Studio & Links with HD & 360. I haven't heard any of the hardware integrations yet, but I'm unimpressed with UltraHD on iOS & Mac clients.
Qobuz still wins. The French had to finally win something...