Moderna and Pfizer are both very similar and likely cause Myocarditis for the same reason. However it's also likely that people will have a worse reaction to M

Moderna and Pfizer are both very similar and likely cause Myocarditis for the same reason. However it's also likely that people will have a worse reaction to Moderna (if they have one) because the vaccine doses are far larger than with Pfizer. This is born out in the statistics that show that while we see Myocarditis for both vaccines, the prevalence seems to be higher for Moderna.