Technofreak:
I agree there is no one best option. For some countries because of their situation with respect to Covid one vaccine may be better than another. As you say the approved vaccines do a very good job. The relative benefits of each pale into insignificance in comparison to catching or not catching Covid and the effects Covid can have and an individual.
The problem in Australia is the media did such an amazing job of scaring people away from the AZ vaccine. There are multiple cases from the current cluster (including one of the first to spread it) who should have been vaccinated due to their age but weren't.