I.M.H.O. the best platform is x86 at the moment… with USB output, i can hear great (speaking in audiophile language 
) differences between raspy and mine actual mini-pc.
Scene and focalization are improved, i use also an iPurifier2 (bought here).
Raspy needs to be reclocked to give nearly the same SQ, but then maybe it’s better to use a coaxial input to dac from allo digione.