Bel Canto Dac 3 or Wyred 4sound Dac2

The used price of a Bel Canto Dac3 is priced in the same ballpark as a new Wyred 4sound Dac 2. Anyone compare these 2? Which one would you keep and why.
I haven't, yet I've been reading around several DACs, including these. If you are planning on a computer feeding the DAC, then the Wyred has an edge with the asynch USB.

Hopefully someone jumps in with actual experience in regards to sonics.
Are you interested in the preamp functions, or DAC only?
Unfortunately, have not heard the Bel Canto, but for what its worth, just set up a Wyred 4 Sound Dac2 in my system yesterday. Right out of the box I found it very impressive.