Sheesh, I wish there was a way of knowing. No one I know goes through enough high-end forks to be able to offer a meaningful comparison. I've always figured that in dealing with the big carbon fork makers that everyone likes -- Reynolds, Easton, Kestrel, Profile, AlphaQ -- you've got to shop by price, weight, steerer material (if you've got a preference), shape (straight? bladed?) and aesthetics, and leave it at that.
Aside from those basic factors, I don't think much beyond brand loyalty steers most fork shoppers.