You’re right, there are many different types of questionnaires at the doctors’ disposal. Which one the doctor chooses depends on what he or she is looking for, the type of pain involved, and often the part of the body involved.
For example, there are questionnaires that focus on the pain of migraines, while others focus on the effect of hip pain on mobility and every day life. Therefore, it would be impossible to say which questionnaires are the most reliable.