Let me know if you ever get a good answer. I would add Wavelength or Ayre to the list. I was very interested in the results, and surprised that no one had an opinion.
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Best to audition them.
I have had the W4S DAC2 and the Bel Canto DAC3.5VB in my bed/study room.
Preamp is an ARC Ref5SE and I am driving a pair of active Quad 12L Studio monitors.
IMHO the DAC3.5 sounds better. Lower noise floor but more than that, it sounds quite musical.
Both benefit greatly with a good preamp.