At first, I was going to choose Chespin because of my Grass-type tradition. I threw that out the window once I saw Fennekin's evolutions. So I chose Fennekin. It broke a very long tradition spanning from the first time I played Pokemon for good reason.
Its evolutions are my new Pokemon obsession and basically my favorite ones ever. I LOVE Braixen and loved it the first time I laid eyes on its elegant feminine design.
It single-handedly made me decide to change my fursona from a dog (which has been like that for... over 10 years now) to a fox because of how much I just felt it resonate with me. It has everything I like in it: fire, red, canines, and magical witchery. It's even two of my favorite types when it's a Delphox; Fire and Psychic. Those were the types of my fakemon version of myself. When I looked at it, I knew it was so me. Even though I like fire, I like red, and all other aspects that it incoperates, it's designed in JUST the right way that it looks so... me. It has aspects of something I would design, and yet wouldn't at the same time, but these combine together to make me absolutely adore it. The execution of this creature is near flawless. At first, I wasn't sure what to make of the stick in its tail, but I grew to love the idea. A Fire-type witch (later Psychic) with a blazing wand which simultaneously makes its tail look like a witch's broom? How ingenious and creative is this design?
Don't get me wrong! I still love Delphox. Which one I like better depends on my mood and how it's designed, really. Most of the time, I prefer Braixen. (Mostly due to not being the biggest fan of Delphox's 3D model) But the fact that Delphox is dressed in its own red fur robes and has more red in its color scheme is definitely more appealing. Overall, I love them both and love aspects of the two.
My Delphox from my first playthrough is currently named Aureleska, but I'll be restarting with yet another Fennekin chosen very shortly today and that one will be called Arkra. I can't wait to see it turn into a beautiful Braixen. Just can't get enough of these foxes.
I think Kalos' starters are the best ones yet other than Johto. They are the only ones where I like all three; rather than just liking two of them and disliking one. (Or in the case of Sinnoh: not liking any of them.) Their design concepts are interesting to me, as I like the idea of a mage, rogue, and knight adventuring with you. Of course, I always pick the mage, but thinking about how other peoples' choices reflects their playstyle is interesting to me.
Sorry, I have Fennegasms/Kalosgasms sometimes. ^^;