I would choose to be an elephant. I like elephants: they are huge, intelligent and, outside of poachers, no animal dares to cross their paths (there are some rare exceptions, like desperately hungry lions).
Nah, I am joking: I chose NT. Why? Because, as it was pointed out by qawer, it is merely a matter of self-esteem. And I have none: I am very unsatisfied with who I am.
_________________
DISCLAIMER: It should be noted that, while I strongly suspect I have Asperger's syndrome, I am not diagnosed. Nevertheless, my score on RAADS-R is 186, which makes me a pretty RAAD guy.
Sorry for this terrible joke, by the way.