What Digital to Digital Converter Do You Use? Why?

+1 @jackd HOLO DAC’s are designed with USB as the favored input. With KTE versions they designed further enhancement to that input. Also, any power riding on the USB cable is nulled before galvanic isolation.

I always stay away from converters. Add extra stuff to the signal path is always a bad thing. I use what is native. 
 

Which input is better is always dependent on the output device and the input device. USB has recently added to the list of legitimate inputs. It was originally a computer thing and not associated with high end audio. Was added as folks with computers started using them as streamers. They are now becoming main stream.

Other than the Holo DAC I’ve never heard anyone say they preferred another connection to i2S.  Some extra connections are worth making it seems. 

I know some people who prefer AES/EBU over I2S.

Wow!  So I’m not the only one!!  I have conducted several A/B tests between my Gustard U18 & PS Audio Directstream DAC with updated firmware - every time the AES/EBU wins hands down.