Which is stricter, Beijing Customs or Tianjin Customs?

Both customs have strict inspection standards.

The inspection standards of Beijing Customs and Tianjin Customs are strict. If you need to buy more items, you must declare, otherwise you may not pass the customs.

Beijing Customs and Tianjin Customs are both directly under the General Administration of Customs of the People's Republic of China. They are all responsible for supervising inbound and outbound means of transport, goods and articles, implementing national foreign trade policies and various import and export management regulations, collecting tariffs and other taxes and fees, supervising processing trade and bonded goods, compiling customs statistics and cracking down on smuggling.