So difficult.
I love all my animals tremendously. Regarding snakes, I love Shayna (BP) for her beauty and temperament, Figment (Corn) for his ease of care and calm demeanor, and Behira (my BCI) for her more advanced care, her adult size, and her puppy dog tame, but fearless, way about her (when food isn't involved).
I am really torn. I think Behira is my most impressive snake and my favorite to hold. She balances looks, size, temperament, and will be a challenge as an adult (size alone). So, I would probably say her, but really, there's a reason I have 3 snakes and 6 reptile tanks!
OP, why such a tough question?