The decision was based on tech. Sparky has a USB port (unshared) on bottom making it perfect for USBridge. On RPI the USB is shared with the network. Not good.
DigiOne is a i2s master…sparky is not alowing i2s master codec…only slaves.
Regarding noise…12uV ( not mv) or 50uV…They are both very low. I doubt that it will make any difference.
Roon discount code is still valid.