Any comments on AES/EBU XLR digital cable VS. BNC Cable

SimAudio reports “The BNC connection is using the SPDIF path like the coax and optical, so AES/EBU is still the best sounding digital input for the SimAudio 380D DSD DAC”.  

I am keeping my AES/EBU connections.  Thanks.  

For my Berkeley Alpha DAC, which I mostly use direct-to-amp, the manufacturer recommends AES on XLR over S/PDIF on BNC. For Berkeley Audio Designs, the crucial difference seems to be the fact that the voltage output of the AES standard (5 Vrms) is ten times that of the S/PDIF standard (0.5 Vrms) and this yields, or can yield, superior performance. . .

Can any of you help me understand what digital input is generally considered the best  -  between my Bryston BDP-3.0 and any other DAC, or, specifically a Hegel H590 integrated amp with its DAC. 

I use AES/EBU XLR digital interface between my BDP-3.0 and any other DAC that has that input, because I understand it's generally considered the best interface.

The H590 does not have a AES/EBU digital input, though it seems to have all the rest.

So, what is generally considered the closest to the AES/EBU digital interface... and... why?

Thanks for your help...  

The people at Schiit always thought AES/EBU or Coaxial was the best, but now with their new Unisom USB input card they say it's the new best sounding input.