Snake River Audio Boomslang SPDIF but not a coaxial design.  Snake River Audio just dropped a three conductor Takshaka SPDIF also not a coaxial design.  It's a hybrid comprised of one part silver, one red copper and one gold

N

I use a full set of Audio Sensibility cables and highly recommend them. 

If you go the AES route, I have one for sale here on AudioGon. Price is negotiable. 
https://www.audiogon.com/listings/lisbeca8-audio-sensibility-signature-se-aes-ebu-xlr-digital-interconnect-0-7-meters-interconnects

I compared the Audience Studio ONE AES/EBU Digital cable and the AudioQuest - Carbon - AES/EBU Digital Cable to the Audio Sensibility cables in my system. The Audio Sensibility was warm AND more detailed than both. 
 

To emphasize earlier comments, different devices and user preferences may lead you to chose different connection types. For my setup, I preferred a USB connection over an AES connection. Experimentation in your system is the only way to find out which you’ll prefer. 

Oyaide DR-510 / DB-510 Digital Cable

+1 for @likecap -- the DR-510 is easily the best digital coax cable I've tried (of 4 or 5). The price has gone up since I got mine, but I'd buy it again in a second. The sound is lush but resolving:

https://www.thecableco.com/dr-510-db-510-digital-cable.html?srsltid=AfmBOorHhth8DgHaCxEAfuBm0FiDAvH0b3qZ3LT2d8jsCwvRkU4nfyg4

great insightful article. Looking for additional advice. Thanks in advance

Currently have a Audiolab transport and a Meitner DAC Ma 1 V2 in a secondary system. Will most likely upgrade transport in near future, but, it is what it is now. 

Dac and transport connected via Coax (decent cable, not to expensive, don't recall brand) Am awaiting a Bricasti m5. Will be hooking that up to the DAC via a Good AES/EBU cable. With the exception of the Transport, all cables are balanced throughout.   For now the current transport only has coax and optical. My new transport will sport a AES/EBU connection. Question: With only one AES/EBU connection on DAC, which unit should get the COAX and which the AES/EBU?? Thanks, Robert TN