Darrel,
It's good to see ya in the 'hawk forum. I am gonna agree with cray on this one. The new ATC hawk looks damn near perfect. I personally like the look of the "bearded" type 'hawks. For stickability(I think I made that word up)it would be a little better to let the top edge come up a little also, it ups the stick percentage a bit. I think weight is probably the most important aspect of a good throwing 'hawk. You could have the greatest design ever, but if it is too heavy to throw repeatedly, it is useless.
As far as a utility hatchet, I think the most important aspects are; edge geometry, weight(needs a bit of heft to it, but not too much) and handle comfort. The design will be worthless if it is too uncomfortable to use. The problem with most axes today is the edge geometry, the edge is just too thick and does not chop well. The edge of an axe does not need to be as thick as the average axe company thinks it should be. That is where a skilled maker comes in handy. Find the perfect ballance between a strong edge and a thin edge. Don't just slap on any ole bevel and call it done. The goal is to make an axe that chops WELL.
Of course steel type and heat treatment are an equally important aspect of both hawk and hatchet.