As I have mentioned, China has multiple covid mRNA vaccines in the pipeline. It is just that they are not prioritized. Beside the most promising vaccine in China right now is Clover subunit vaccine which has a better first phase trial result than Pfizer, Moderna and Novavax.
Sinovac vaccine is based upon traditional inactivated method that has proven to be safe. Sinovac vaccines have reported lower side effects than Pfizer in all other countries except Hong Kong. Given how Hong Kongers and the media of Hong Kong have always been bias against anything China, these kinds of negative publicity is guarantee. As for efficacy rate, mRNA might offer a better efficacy rate but no one knows how it fares with new mutated version. Astrazeneca failed miserably with the SA variant, J&J and Novavax didn't perform well either.
In HK, around 7 people have complications or have died from the Sinovac vaccine, out of around 150,000 people who took the Sinovac vaccine so far, there was some hype in the yellow media, The past few days there have were complications and deaths from BioNTech. All these folks who kicked the bucket had the full range of health problems, including typically high blood pressure and diabetes.
Currently only Sinovac and BioNTech are available in HK
I took the first shot of Sinovac vaccine this afternoon, with no issues at all. Bookings are full and people are showing up, despite the media claiming "many are walking away from their bookings because of vaccine deaths".