How many manufacturers are there for COVID-19 booster needle? Which is better, Kexing COVID-19 vaccine or national medicine

Several manufacturers

of COVID-19 vaccine have five vaccines that meet the requirements for listing:

1. Inactivated vaccine

of Sinopharm Sinopharm Beijing Co., Ltd. 2. Inactivated vaccine

of Sinopharm Sinopharm Wuhan Co., Ltd. 3. Inactivated vaccine

of Sinovac Sinovac Beijing Co., Ltd. 4. Tianjin Kangxinuo adenovirus carrier vaccine

5. Zhifei Biorecombinant COVID-19 vaccine (CHO cell)

which is better

of Sinopharm and Kexing COVID-19 COVID-19 vaccine