In the US EUAs at the beginning, for me, it was 95% the technology and 5% the manufacturer convinced me mRNA vaccines were superior because of their precisely-targeted nature. It was a gamble between Pfizer and Moderna. Went with Moderna for the first 2 (before the data on "mix-and-match") and Pfizer booster.

Btw, sequencing of both mRNA vaccines:

https://github.com/NAalytics/Assemblies-of-putative-SARS-CoV...