The general consensus is that there is no general consensus - use what sounds best to you.
- several here claim they enjoy coax best
- Rob Watts, the designer, has given objective and subjective reasons why he prefers the optical --toslink-- connection (auto-correct, you little swine ..) and they all seem perfectly logical to me. He also gives some reasons why the usual issues around jitter with a --toslink-- cable aren't a big deal with Hugo
- for all of the above, I'm sticking with USB and others are also enjoying various custom USB cable solutions
Note that with coax you will have to ensure that your player is set to convert any SACD/DSD source files to PCM.
Thanks! USB suits me fine,it's now just a question of finding one that fits!