Interesting point about variations to the firecrest shape. This (unfortunately) doesn't make things any easier considering neither have been wind tested.
One observation (pure aesthetic) from pics is that the carbon pattern is different. The Soul's throwing a more marble effect and the Boyd a more plain black carbon.
It would be good to hear someone chime in on the Boyd hubs.. sounds like the soul hubs are pretty solid from doing a search.
We have a 3k weave on all of our carbon wheels. I am in the process of having some very cool photos done for our website and catalogue.
As for the hubs, that is something we focused on the most with the new line. We used to use a very similar hub to the Soul wheels but moved away from the six pawl design as the pawls were kind of small and could stick. So we now have four oversized pawls for very solid engagement. We also moved the left bearing out on the axle for added stability and added a pre-load adjustment. The hubs are optimized for flange geometry based on whatever configuration you are using and we also focused on tension balance between drive and non-drive side. One of the biggest benefits is that we double cross the spokes on both sides of the rear wheel for a much better transfer of torque.
Here's a bit more info on our hubs:http://www.boydcycling.com/hubs/
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The Handcrafted Revolution