I also have tried them all with my Master 7 dac and I2S is the best. The rest are close but I would avoid Optical or Toslink . By the way I use a standard usb cable from laptop to a Singhzer USB converter. Then go from it with an Eithernet cable to my dac. If the dac your going to buy has BNC coax I found that is also very good. Also follow for starters the suggestions of the dac manufacturer
Alan
Alan