Here in Serbia we have access to Pfizer, Sputnik V and the whatever the Chinese one is called. People can chose which one they want (online sign-up) and based on availability get one as soon as possible, which seems to be very soon as not a lot of people are signing up. Opinions are split on which one is the best, some like the Chinese one because it takes the classical approach that is "true and tested" of using the dead virus, the news say most have signed up for the Russian one and some want the Pfizer because it's the only one that is acknowledged by the west, they fear that if Corona passports are introduced in the EU they will not be able to travel with the other two.