From the TGA website, Pfizer appears to be no better option than Astra Zeneca if you compare the data. With Pfizer you're more likely to have Anaphylaxis, cardiac event or a bleeding disorder. I will take my chances with the 6 in 1 million chance of the blood clot taking Astra Zeneca.
https://www.tga.gov.au/periodic/covi...ort-07-04-2021