First of all, the course is good, learning step by step, and it is more convenient. You don't have to go to school all the time, you can go in and study at any time.
In addition, the most distinctive thing is that EF's online courses also have foreign teachers. They have 24-hour classes for foreign teachers, and you can attend them indefinitely. Of course, in theory, it is good enough that you can go once a day, which also exercises your oral English and the price is cheaper than going to school.