How the Oxford-AstraZeneca Covid-19 Vaccine Works - The New York Times

The New York Times articles for these two vaccines look the same.

AstraZeneca Vaccine
https://www.nytimes.com/interactive/2020/health/oxford-astrazeneca-covid-19-vaccine.html

Johnson & Johnson Vaccine
https://www.nytimes.com/interactive/2020/health/johnson-johnson-covid-19-vaccine.html

Both vaccines use a weakened virus to deliver DNA to cells.  Since viruses are known to cause cancer (through DNA mutations), I prefer the mRNA approach of the Pfizer and Moderna vaccines.