For briars, it's lumbermans, canadians and liverpools, and to a lesser extent, lovats. Straights of course, I don't even know if these shapes come in bents.

For cobs, just about any shape but the thicker the better on the walls. Bent or straight, doesn't matter, they all pass a pipe cleaner just fine. I prefer the unplastered versions; I have a MM unplastered freehand that I really like.