Does AES sound better than spdif/Optical?

Sooooo.....



I posted a thread searching for a usb interface that I could use to connect a Burl B2 ADC to my computer. I asked for one under 500 dollars that had AES and people were saying for that budget, go with an interface that has optical/spdif.



But in one of the burl b2 threads, people were saying burl connected via AES sounded much better compared to it connected via optical/spdif.



Is this true, is there evidence to support this? If not, I'd much rather save money and connect Burl B2 ADC to an interface that has spdif/optical.



Thanks-

Does AES sound better than spdif/Optical?