1. Textbook: Thick SIE textbooks are comprehensive, covering the knowledge points that SIE needs, and can be updated quickly to meet the needs of candidates. Sino-Hector's textbooks are more refined and focused, but the coverage is narrow, which may not be suitable for some candidates with poor foundation.

2. Lecturer: The team of lecturers with thick thinking is relatively large, with many well-known tutors. Zhonghe's lecturer team is dominated by young lecturers. Although there are some well-known lecturers, their overall strength is slightly lower than that of Houda.

3. Service: The service of Houda Examination is in place, including answering questions, model examination, data updating, etc., while the service of Zhonghe is slightly insufficient, the reply to candidates' questions is not timely enough, and there are few activities such as model examination.