Why Spotify has more deep music ?

Hi, 

I am a true Deezer fan, but recently 2 of my friends also Deezer fans moved to Spotify as there is more music. 

Why we still miss a ton of albums from some artist vs Spotify ? specially in non-european music: africa, brazil, japan… years that I am waiting to have An Insatiable High from Masayoshi Takanaka for example… and sometime there are albums without all the song like Nem Paletó Nem Gravata from Osmar Milito, it is missing one song. This is so frustrating. 

Could improve that ? 

Aymeric