Does the dac sound better single-ended or balanced?
I'm still waiting for my PWD to arrive. During the audition, it was connected via a balanced interface, but I'm not sure there would much of a difference between really great single-ended ICs vs balanced ICs. I'll use balanced just because it's available and I have some good balanced cables on hand.
One thing to consider is the fact that balanced gives you a 6db gain so if you plan to use the PWD as a preamp that may give you a little extra headroom on the volume.