Lampizator USB Transport vs. Berkeley Alpha USB

Hello - I own an Aurender S10 and I've been using the USB output to a Berkeley Alpha USB to my DAC. My DAC only accepts S/PDIF input, so I need a USB-to-S/PDIF converter. I get great results with the Berkeley, but since the Lampizator is tube-based, I am curious. Has anyone had the opportunity to compare these 2 converters?

Thank you

Dave