I don't really have any hangups related to the type of pipe. I'm more interested in flow and proportion, and I like short and fat pipes because I'm short and fat.
A skinny billiard typically doesn't really do anything for me, but an Al Pascia Curvy 02 hits the right notes. Weirdo stubby shapes like Briarworks chubby tomatoes and stubby apples, or the Moonshine Pot Still rendition of the classic billiard shape also tickle me in the right way. I especially love the Moonshine Cannonball's size and muscular, squat flow.
A lot of bulldogs also don't do anything for me, but the Al Pascia Curvy 03 and the Briarworks C111 Bullmoose press the right buttons for me.
I can take or leave most other shapes/types in a general sense, but the second Morgan Pipes comes out with a stubby/fat Bones version of whatever, it usually appeals to me even if I normally wouldn't be super excited about a particular shape. For example, I have a stubby Dublin, stubby Devil Anse, and stubby billiard from the Bones line--none of those shapes usually speak to me, but the proportions and flow of the Bones versions do.