RPi + HiFiBerry Amp2/Dac+ - Which OS and addons?


I have been considering acquiring several RPi + HiFiBerry Amp2 / DAC + Pro to make a multiroom system. 
I've read and read and there are several OS to choose from.
But unfortunately I´m not being able to understand what is best for what I want. My requirements: 1. Listen to music through Spotify (on Android / iOS) and choose which room (airplay/Spotify connect). 2. Multiple Spotify users with different accounts (Family Premium Account) 3. Android & iOS 4. Be able to synchronize sound in several different rooms (with ease) (5. Choosing a folder on a NAS where I have music.) So which OS & addons can I do this with? Thanks in advance!


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