It is hard to compare efficacy between different vaccines trials sinc each one was tested in different populations. For instance, Sinovac vaccine was tested in

It is hard to compare efficacy between different vaccines trials sinc each one was tested in different populations. For instance, Sinovac vaccine was tested in hospital workers in Brazil. This population is more exposed to the virus and have access to tools that can break the blindness - some people did and posted on social media celebrating. There was no death from covid in the vaccinated population.