That's really interesting that AES /EBU is superior to SPDIF, I was wondering why Mike in the latest video did not mention that in this comparison to why he was trying to make USB good or better, in his case the latest development of USB they are working on in the beta stage is so good that "why even bother with SPDIF". But if what you say is that AES /EBU is better than SPDIF, than I'm not sure why SDPIF could be the ideal way to go about things.
In the case you are using the Matrix Audio interface, may I ask what your chain is specifically to get a better picture?
In particular, what is the transport you use and how does it connect to your Matrix interface.
If you are using a laptop with USB (just case and point) since it is using proprietary XMOS U208, could you say you are still comparing that to USB gen 5 even though you eventually feed into the Yggydrasil with AES /EBU?
If you are not feeding the audio via USB into the Matrix perhaps you are using something else I guess.