What are the differences between pork sirloin and pork loin, and which one is more suitable for a specific recipe or cooking method?

The main difference between pork sirloin and pork loin is their location on the pig. Pork sirloin is leaner and located closer to the hip, while pork loin is more tender and located along the back. Pork loin is more suitable for recipes that require a tender cut of meat, such as roasting or grilling, while pork sirloin is better for recipes that benefit from a leaner cut, such as stir-frying or braising.