I agree, XLR is definitely the way to go based on specs alone, but the audible difference is significant.
I don't know if anyone else feels the same way, but I'm finding the AES input to be superior to the USB, but I don't have an I2S source to try. I also slightly preferred using Optical (with a glass fiber cable) over USB from my Auralic Aries.
Lastly, upgrading the internal fuses really takes this DAC to the next level. I am currently using the HiFi Tuning Supreme3 Cu fuses but I may try the Ag version out down the line. For $50-$100 or so, it's an amazing return on investment.
According to Aoshida, the DAC uses both fuses in 115V operation and just a single fuse in 220V (2A small slow/delay fuses). See below:
"The engineer said from the live wire of the power tailstock to the fuse is the direction marked by you.
The red color is the fuse of 220V operation,
For 115V operation, the red color and blue color works at the same time."