Your Sweet Sixteen experience is more of an American tradition that the majority of people do meaning the sweet and innocence in a girl especially for girls on their 16th birthday that people love to celebrate because they believe it is a once in a life time experience, while Quinceanera also called a fiesta de quince anios, is a celebration of a girl's 15th birthday in parts of latin American countries and the majority of latin America. This birthday is celebrated differently from any other as it marks from the transition of childhood to young womanhood. Hope this gave you some help. Have a good evening.