Long-term classes may be a long-term goal, the scope and time of exams will be longer, and you will not learn more knowledge in a short time, that is, you will learn to arrange some tasks at a slower pace.
The second is the cost of training courses and long classes. Long classes may cost more, and then teachers in long classes may not be as good as training classes.
Because the training course is a short-term task that must be completed in a short time, there must be better teachers and reserves. These two points are training institutions. The biggest difference between a training class and a long-term class is that there will be obvious differences in fees and objectives.