Pfizer contains 30 micrograms of virus's genetic material; for some reason, Moderna went with a much larger dose, 100 micrograms. That might be the reason. I had Moderna and got pretty sick for about 24 hours or so.
Got "Pfizer" . . . Other then my arm being a little sore, hope there are no other ill after effects . . . Just Sayin' . . .
.