I use "Exclusive", "Integer", and "DoP" settings on both Audirvana and Roon. On SPK side, I always set to DoP. This setting affects only incoming DSD signal, nothing to do with PCM. If you choose PCM option, DSD signal will be converted to PCM on SPK.You answered the first question, and yes, i'm wondering if DSD is better
I'm trying to figure out the best settings to use for using the SP1000SS in DAC mode with Audivarna
Discussion about DSD vs PCM is off topic and controversial.