Shanghai High School is generally considered better than Huahai Second High School. This conclusion is based on several factors, including academic performance, reputation, and resources.

Shanghai High School has a long-standing reputation for excellence in education. It consistently ranks among the top high schools in China, with a strong emphasis on academic achievement. According to the 2020 China University Entrance Examination (Gaokao) rankings, Shanghai High School was ranked 2nd in the country, with a high percentage of students scoring in the top 5% of the national exam. This indicates a high level of academic rigor and success.

In contrast, Huahai Second High School does not have the same level of recognition or academic performance. While it is a reputable school in its own right, it does not rank as highly as Shanghai High School. The 2020 Gaokao rankings placed Huahai Second High School at a lower position, reflecting a slightly lower average academic performance among its students.

Additionally, Shanghai High School benefits from superior resources and facilities. The school is located in the heart of Shanghai, providing access to a wealth of cultural and educational opportunities. It boasts state-of-the-art facilities, including modern classrooms, well-equipped laboratories, and a wide range of extracurricular activities. These resources contribute to a well-rounded education and prepare students for success in higher education and beyond.

Furthermore, Shanghai High School has a strong network of alumni who have gone on to achieve significant success in various fields. This network provides valuable connections and opportunities for students, enhancing their prospects for future careers.

In summary, Shanghai High School is generally considered better than Huahai Second High School due to its superior academic performance, reputation, and resources. This conclusion is supported by data from the 2020 Gaokao rankings and the school's overall educational offerings.