Fennekin is my choice. I've always adored fire foxes [Ninetales is my favorite fire type o.o;], and Fennekin certainly caught my eye. HOWEVER I do admit the initial design is... a little awkward. Curiously bland, and even greatly alike to Zorua... So if the evolutions are revealed, I may decide against Fennekin. I'll likely avoid Fennekin if it is to go bipedal.
Though I do hope to acquire Froakie as well, he has perked my interests. He's my second choice, if Fennekin is to sour in my tastes.
Chespin, because he heavily resembles Oshawott to me, has earned my ire. I may use him if I see is evolutions, but there are no guarantees. Otherwise, I won't be using him.