I like a wide variety of shapes and sizes. It's easier to list the shapes that don't appeal, bulldog and Dublin. I only own a couple of those. While I like the look of the Dublin, it's a shape that's prone to structural failure over time because the the uneven wall thickness and thinner walls at the base of the bowl. The bulldog is just a butt ugly shape to me, one which can also be prone to structural failure where the walls get thin along the base.
I like apples and pots. I also like volcanoes, billiards of various types, acorns, and some freehands, especially weird stuff. Oh, and I like wax drips. Get over it.
Since I don't smoke only one type of tobacco, or have the desire for smokes of only one length of duration, different chamber sizes come into play.