Of the two institutions, I prefer Xiangshan. Although Zhonggong is a listed company, there are too many kinds of exams involved in Zhonggong. I think online classes are normal, and I have also taken ground classes. The quality of teachers is uneven, and it is especially good to have lecturers from Beijing headquarters. But some really can't. Xiangshan started from the teacher recruitment examination, and it is good from books to teachers.