Regarding the shape I personally find the FK more comfortable but I use a claw grip. The response to the FK shape has generally been a lot more positive.
I personally would not choose a coating based on the color scheme. In the end, the thing that is most going to matter is how it feels to you. For me personally, I strongly prefer glossy coatings in general, and the Zowie glossy coating is one of the better ones that I have tried. But coating is also a personal thing. Some find glossy coatings to be slippery and unusable. I have naturally dry, not oily hands, and find the coating Zowie uses to be pretty much perfect. The best thing I can say about it is that I do not think about the coating when I am using it. I could not say the same for the normal AM.