I strongly disagree with Cerrot on this subject! I have used both and USB has come a long way to now being not only included on all high-end dac's but the digital input that I and all reviewers feel produces the best overall sound reproduction in all respects of measurement. I will never go back to S/PDIF due to the conversion that takes place that produces jitter! USB is the future of computer audio in my opinion and can only improve as it continues to evolve. USB 3.0 will be the next generation. Windows 10 will not require a driver for 2.0 USB which will improve it's bandwidth all the more. USB audio is the future of High-End audio!
Regards,
Trueaudiofile
Regards,
Trueaudiofile