Hong Kong permanent residency's four most important things:

1. Children's scores: no need to compete fiercely in the college entrance exam, DSE exemption for 138 top universities in mainland China, Overseas Chinese student joint exam 400 points to enter first-tier universities
2. Your freedom: passport visa-free to 170 countries, no need to look at the visa officer's face
3. The family's confidence: 100 yuan per day for hospitalization, pension at 65, can also receive benefits when retiring in mainland China
4. Two paths: mainland hukou not canceled, no purchase restrictions for buying property in the Greater Bay Area