Best way to stream music to Gold Phantoms

[eniriop]

What is the best method in terms of sound quality to stream music to Gold Phantoms (RAAT, UPNP, Optical)?

Buy Audirvana for Mac and suscribe to Qobuz studio and use either UPNP or optical from a Macbook or similar to stream Hires content (look for the yellow H in Qobuz). Much better than airplay. With Audirvana remote (free app for Ios) you don't need to stay by the laptop Mac. You can navigate with the Apple smartphone.
If your wifi is not so great better use optical than UPNP and plug both phantoms in the same outlet or connect them with an ethernet wire.