Super-secret Ninja Club sounds way cooler than the whole BFF thing.
The quote from Stephenie Meyer's "The Short Second Life of Bree Tanner" expresses the idea that belonging to an exclusive and mysterious group, like the "Super-secret Ninja Club," is far more appealing than simply being part of a conventional friendship circle represented by the term "BFF." This indicates a desire for excitement and adventure that goes beyond standard social dynamics.
The juxtaposition of the two concepts emphasizes the allure of secrecy and uniqueness over ordinary connections. It reflects a yearning for something different and thrilling, showcasing how the protagonist or speaker craves a more adventurous and vibrant experience than what typical friendships offer.