ROFL.. this is a purely politically motivated poll. I am not a big fan of Western pharmaceutical companies, but from the available data it is clear that the vaccines from Pfizer and Moderna have the highest efficacy (>95%). The OP hasn't included them in the poll, probably to favor his pick. On the other hand, the Sinovac vaccine has a single-dose efficiency of just 3%, according to a study performed by Universidad de Chile.