there is a 30pt difference in effectiveness is the actual reason. Any rational person would prefer an mRNA vaccine to the Oxford one. Given the option, sure.

there is a 30pt difference in effectiveness is the actual reason. Any rational person would prefer an mRNA vaccine to the Oxford one. Given the option, sure. But, that option doesn't exist today due to limited availability of all vaccines. The option is really 70% (AZ) vs 0% (nothing) vs ??? (unknown chance of mRNA jab in the near future). Any rational person would prefer 70% today. And that's completely ignoring the severity. As far as I've been able to tell, all the current vaccines provide near 100% protection from severe cases of COVID.