Yeah, Pfizer optimized for acceptable performance with fewer side effects, Moderna optimized for best performance with less regard for side effects. Hence the

Yeah, Pfizer optimized for acceptable performance with fewer side effects, Moderna optimized for best performance with less regard for side effects. Hence the general pattern that Moderna hits you harder than Pfizer and of course the hesitant go with Pfizer if given a choice. The flip side is those of us who don't react badly will tend to go Moderna for the boosters. That also means that going forward we can't compare real world effects because the distribution will be decidedly non-random.