I prefer dogs with good physical structure, if possible.

However, of the 6 best dogs I have ever owned, only 2 had perfect structure.

Stormbringer was small for his weight, but THICK and POWERFUL. He had a strength all out of proportion to his size, incredible intelligence, and his build worked perfectly for him ... yet he would never have placed in a show. I've never seen a dog his weight I could imagine beating him.

Icon was undershot and had straight stifles. He whipped many dogs with better conformation, pushing weight, and with no teeth.

Missy was undershot and a little long-bodied. None of the bitches her size could make it to the :12 mark, without their owner's picking up their bitches with fractured muzzles/eyesockets, etc. ... except one guy who picked up in :21 and his bitch didn't make it to the next morning.

Jezebel was perfection Style + conformation.
Silverback had great conformation, and was a helluva dog.

Ultimately, I breed for a style, and "something exceptional" (be that speed, strength, finish, whatever). I place a lot of stock in conformation ... but not so much that I am blind to what I am watching.

Jack