I've been trying all of them recently.
Amazon Music is okay. Like with all Amazon services, it is just okay and "good enough", it has nothing special and UI looks horrible, I hate the transparent background design. It is nice they include lossless and hi-res in the price like Apple Music does. As a Prime member, I want to like Amazon Music more for that bundle price.
Apple Music is good. Cross platform support is getting better, but Windows on iTunes is still horrible. Music on Mac isn't much better to be honest, it is buggy. Yeah, the algorithms and playlists are slightly better on Spotify, but I think Apple Music is better in most ways, and it is nice they include lossless, hi-res and Atmos at no extra cost.
Deezer is okay. The search on Deezer is pretty bad and the apps are quite buggy. It is also slightly more expensive than the competition, they only go to CD quality, but that is more than enough for most people. They also have quite strict limitations on the amount of songs you can add to your library.
Spotify is good. Controversies and lack of lossless aside, Spotify is kind of the standard. The app is more feature rich than most the others and there are loads of playlists. They recently lifted restrictions on library size. I still keep the free version running to sometimes move playlists to Apple Music.
Tidal is okay. Tidal Hi-Fi is now $10 a month. Also, the only one mentioned with Exclusive Mode, so on Windows and Mac it will correctly match the bitrate. The problems with Tidal are that all the apps are buggy. A 10,000 song library limit. Some smaller artists are not on Tidal and I have heard of some smaller artists not receiving payment from Tidal. Tidal also has good integration with DJ apps and audiophile streamers if you are into that. If they got rid of the 10k song limit and made the apps more stable, I would probably move to Tidal.
YouTube Music is just horrible. No basic features like normalisation. The interface is horrible. Audio quality is the worst. It is a shame, because the YouTube Premium bundle is a good deal if you watch a lot of YouTube. YouTube Music is probably fine for just a casual music listener as an added extra to Premium, but for more serious music listeners I would stay clear, unless you listen to really obscure music that is only available on YouTube.