I'm not a huge fan of toy breeds, or at least I don't see myself owning one anytime soon, they just don't fit my lifestyle at the moment but even so or maybe because so I can't pick just one.
I have quite a few that are all tied as my favorite. lol

Chihuahua, Pug, Pekignese, Chinese Crested, Japanese Chin, Cavalier King
Charles Spaniel, Miniature Pinscher, Shih Tzu.