Digital XLR vs Digital RCA


How would a digital XLR 110 ohm cable compare to a more costlier Silver 75 ohm RCA cable? I will do the comparison between the two myself and post my results but I thought I would ask for other people’s experience between these two types of cables.
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Is it okay to run both cables at the same time to AB them or should they be run one cable at a time?
This is somewhat of a controversial subject.  I have read some people state that AES/EBU XLR digital interface has design issues and not as good as RCA/BNC.  Others say that AES/EBU is far superior.

You can run both cables to the DAC at the same time and just A/B the source input on the DAC.
How you gonna compensate for the 6db diff.?
Any level control you insert will affect the SQ.
I was told by someone who designs high-end DACs that a balanced digital cable is preferable to single ended and that if only RCA connections are available it’s still better to use a balanced cable with RCA adapters.  I have no technical understanding of why this would be but just thought I’d pass it on FWIW.