Hello,
i own both and they are connected with Krell KPS 25 sc 24/96 cast II.
The Wadia 170 has Acoustic Zen digital cable to Krell digital in.
The Krell Kid has symmetric Siltech cables to Krell analog in.
The Krell Kid sounds definitely better, more analog, soundstage is bigger the vocals are much better.Krell has as much detail than thru Wadia 170.The Wadia 170 in comparison to Krell KID is more digital sounding.I use only WAV files on my I POD Classic 160 GB.