What a terrible question! I don't want to choose!
I love the graceful shape of the Heliamphora. The ecology and history behind the Nepenthes is fascinating. The diversity and savage efficiency of the Drosera is admirable. The novelty of Genlisea is hard to come by. I could probably make similar statements for the rest.
Maybe if someone were to help me flesh out my collection, I could make a more objective judgement... :P