I think, favorite head design is based on the number of strings.
Crown head is tradition of Alembic.
It's still favorite one for 4 strings.
Knobby head is fitted for even numbers (6,8,12...).
Knobby with 8 Schaller M4 is one of my favorite.
Now, My Favorite is Fan head for 5 strings.
Asymmetrycal 5 posts are under the perfect balance of circle, just like Celestial sphere.
Of course, cloud and hand are also under the sphere.
Eiji