To be honest when the 3 Kalos where originally introduced in January 2013, didn't liked any of the 3, back then still loved cats more none of the 3 resembled any - but some time around April and May I started to fall in love with foxes - so naturally Fennekin started to catch my attention.
When XY came out I made up my mind and choose Fennekin as my starter.
Now Fennekin is my most favorite of all starters combined.
So cute in game (and in the anime too)
Braixen is my 3rd Favorite Pokemon (behind Flareon and Ninetales)
Delphox awesome looking (and cute too).
So happy I choose them as my favorite.
Anytime I play an X, Y, (and next 6th generation main game) I will gladly choose Fennekin.
as for the other 2?
Chespin is OK, funny in the anime.
Quilladin looks odd at first getting used to it
Chesnaught at first didn't liked since it didn't resemble Chespin or Quilladin at first, getting to slowly like it
Frokie and it's two evo's to this day I can't stand or like, they are almost rock bottom at my favorite's list.