My understanding was that moderna had 3x more active vaccine ingredients and lower cold chain requirements, while Pfizer also needed to be mixed / prepared befo

My understanding was that moderna had 3x more active vaccine ingredients and lower cold chain requirements, while Pfizer also needed to be mixed / prepared before injection. It seems like Pfizer had more opportunties go wrong especially when rollout was outside of hospital settings and at population scale. My understanding was initially Pfizer was limited to hospitals in Canada, but ended up in pharmacies and other temporary sites.