My taste in pipes has certainly evolved. I used to be interested in only classic British billiards, pots, apples and bulldogs, whether straight or bent. Now I have just one such pipe, a Dunhill shell bent billiard, that I use for travel.Somewhat off topic, but kind of related to pipe shapes. I'm amazed at how my tastes have changed from when I first started on this journey. Going from, "damn, what an ugly pipe, no way would I ever consider that shape in my collection!" going to "damn, I've gotta have that pipe...NOW!"
I read the thread, linked by @dunnyboy, there was a discussion about the Rhodesian & Hungarian (Oom Paul) shapes. I've always liked a bulldog/Rhodesian shape bowl, but prefer the diamond shank of the Rhodesian. As for the Hungarian, it never really appealed to me. However, that has started to change recently, for whatever reason, and I find myself regarding this shape more & more. Not saying I want one immediately, but who knows? it's certainly not off the cards.
Most people think bulldogs have diamond shanks and Rhodesian oval or round shanks. Mind you, I've seen them labeled both ways. Personally, I prefer the diamond shank too.