CONFUSED: USB -- a "solved" problem, or back to SPDIF?

[misterspense]

The hard thing in comparing USB and SPDIF is not on the dac side, but the source, there are not many sources that have both connection types.

So stating that Spdif on your dac sounds better (or worse) than Usb, does not tell us that much, because you can then also say, from the same listening comparison, that your cd player sounds better (or worse) than your "fill in your computer or pi, with or without usb decrapifiers".