Whatever streaming platform you choose, there will always be platform-exclusive and region-locked content...
I listen to some Japanese songs, others used as opening and ending theme in Japanese shows and anime, but in my local YouTube version, I cannot access official uploads and I only knew this when I used a VPN...
As an example, try the keywords aioraito joy
The intended result is either the YouTube Music version or the PV [promotional video] for the song, however I only get the official YouTube Music version and not the music video uploaded by Sony Music Japan... If you are able to access the music video, then your country is one of those that are allowed to access that, my country is not in that list...
If you are not familiar with the song, this is the YouTube link accessible to where I am located:
Aioraito
For music only, my choice would be Spotify... I also like that Apple Music has the official PV [promotional video] for the song unlike in YouTube where you have to dig deeper or even use a VPN to find the official upload since the usual first few results are user uploaded content that uses the song I was looking for [which was the original intention of YouTube, content uploaded by users, after failing to become/grow as a dating site]
But then again, a VPN is your friend for region-locked content... This does not only apply to music... Even full episodes of WWE Raw and WWE Smackdown on YouTube are only accessible when you are in a particular country...
In terms of recommending similar song/content, YouTube and Spotify are two of the best when it comes to their algorithm... Apple Music has more of a recommendation by human [or their algorithm is not as strong as YouTube and Spotify]