There isn't a whole lot of useful software for the Gear S3. That is why Spotify makes a big splash. It's a standalone app that streams music over Wifi to the watch and then feeds bluetooth connected headsets or speakers, and would even play through the watch speaker. Sadly it does not have an offline mode, so you need Wifi. In the US, some carriers sell an LTE-enabled S3 Frontier which isn't available here.
This is the first version of the software. Maybe a future app will allow you to download tracks and play offline.
And that's an app where the 50% larger battery compared to the Gear S2 makes sense.
I don't see much use without offline playback.
I have to agree with @Ralph.
Home = WiFi + Sonos speakers.
Out = Offline + Headphones.
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