I'm with The Sloth on this one. There are plusses and minuses to both systems, but the one huge advantage of the dual 3-pin setup is that it allows you to run single-ended out of the same connector. Now if you could get Neutrik (or someone) to make a 4-pin combo jack I'd have a lot harder time making a case for the twin connectors. Really I don't see the big deal though, you can just as easily make a pigtail to convert the 4-pin to dual 3-pin.
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SB3/Arcam CD73 -> Hertsens Signature DAC -> Project Menace -> HD650 | Woody HF-1
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