Sci journals are divided into four regions. Among the four regions, the first region has the highest impact factor, followed by the second region. So strictly speaking, only one region can be regarded as a truly top periodical.

We need to stand from different angles to judge whether the first area of sci is good or the second area is good. Generally speaking, although the first area of sci is better than the second area, it is not absolute. Even in the second field, the journals of a certain subject are not worse than the first field. Therefore, the author should match the appropriate sci journals for his papers according to the actual needs.