The format may be relevant, but I think it's mostly just the recording setup. like binaural recording.

 

spotify: ogg(vorbis) AAC
 

youtube: opus m4a(AAC)

 

https://en.wikipedia.org/wiki/Opus_(audio_format)
Opus replaces both Vorbis and Speex for new applications, and several blind listening tests have ranked it higher-quality than any other standard audio format at any given bitrate until transparency is reached, including MP3, AAC, and HE-AAC.