Individual lessons are good for students who are still trying out lessons with a particular teacher and are still unable to commit to multiple classes. It is also good for those who are only looking to review certain specific aspects of a subject.
However for those who really wish to progress in their academics, hobbies, or other types of lessons and classes, booking courses are more likely to make a long term difference. When you book a course, there is a clearer goal that you can work towards with your tutor. It provides a greater sense of purpose as to why you are taking the lessons and helps you organize your time and pace.