The shape. But the branding is fussy too. Who wants a blue stripe on their headset? That nice plain one I linked is cheaper too! Looks about the same shape as a Chris King, but without the ridiculous spend. Once you have ally cups and cartridge bearings, what more do you need in a headset?
@user147336
Speaking of anti, that Cane Creek number looks a bit fugly to put next to a Minimal. Wouldn't you prefer something like this?
http://bikeblvd.com.au/products/alloy-threadless-headset-black-1-sealed-bearings-frombpw3025
By the way, don't go hammering a star nut into that carbon steerer, you need to find a 1" expander plug.