If you want details on each Vax go to the WHO website, or better still ask your GP. Don't folly around with local studies and in process research. Reading incomplete and study in progress data leads you to information that could be tainted by financial or ideological bias, and without a full medical background you will most likely misconstrue the information and come to some weird conclusions that were never the intent, hence half the comments on this page.
Fact is no medicine is completely safe, Astro Zeneca has a morbidity rate of about 1 in 250,000 vs the 2 in 100 rate of death for the virus it protects against. MMR vaccine given to children has a seizure rate of 1 in 3000 under 7 years old and is still advised to be administered at 12-15 months. In medical terms doctors the death rate has to be below 1 in 10,000 for it to be a worry, and of course much less than the condition it protects against.
In terms of efficacy, the Pfizer vaccine protects 94.5% of people from developing COVID.
The AstraZeneca shot protects 70% of people on average — still pretty good and on par with the protection given by a flu vaccine in a good year.
To clarify, both vaccines do not prevent you from getting Covid, however the efficacy is the rate at which it prevents the virus from becoming serious and life threatening.
AZ at present has a 63% efficacy rating, which IMO is too low, however this will still protect you from the most serious effects of the virus should you get it. So like the WHO advise, take whatever approved vaccine is available as this could save your life/health in the short term. You can always back up and take the next version later to boost your immunity. If you are worried about the side effects of AZ, isolate and stay out of the community until you can get the Pf and talk to your GP. My GP is relatively young and has taken AZ, his only worry is the efficacy holding up over time.