I have spent some time comparing the Auricap dock and the VCap dock. I slightly prefer the VCap, but not universally, and it's a much closer race than I expected. The VCap is slightly warmer in the mids than the Auricap. It initially made me think the Auricap was more detailed, but it isn't, actually, it's just a little leaner sounding. The VCap also has slightly deeper bass. Both are truly excellent sounding, though.
If I hadn't bought the VCap first, I might be tempted to save the money and go for the Auricap. However, in terms of physical form factor, the Wood VCap dock I have is not only nicer looking IMO, it has some real ergonomic advantages. I like not needing to brace the iMod while using its click-wheel, which is needed on the wood Auricap dock. But are all these things worth the price delta? Hard to say I guess. For me, in the end, yes, I prefer the VCap dock. But the Auricap dock is the better value for the money.