Personally, I prefer Lezhi English, an online real-life interactive class. The company is in Shanghai, but it is an online class, so I can go wherever I have a computer at home. A real small class consists of less than eight students. European and American local professional teachers teach through the Internet abroad, and China teachers are mostly from China who study abroad or live abroad. The most important thing is not to listen to hundreds of people in a teacher's class, so there are many more opportunities to practice oral English with the teacher.