Canada's National Advisory Committee on Immunization's revised guidelines, the new guidance calls for the Pfizer-BioNTech offering due to "Lower reported cases of myocarditis/pericarditis ... compared to Moderna Spikevax."
What myocarditis/pericarditis? This is a conspiracy theory. The vaccines are safe, bigots. Take your poison and shut up.
Your friend had a life-threatening condition. That's different from the risk of heart damage from the covid vaccines, which is very rare and almost never fatal.
"The highest rate of myocarditis reported in Canada in association with the Pfizer mRNA vaccine has been for males aged 12 to 30 years following the second dose, with about 1.5 cases per 100,000 doses in B.C. Most receive conservative or no treatment and have no serious outcomes." http://www.bcchildrens.ca/about/news-stories/stories/myocarditis-pericarditis-and-the-covid-19-vaccine
"Up to and including September 24 2021, there were 812 cases of myocarditis and/or pericarditis with reports submitted to the Public Health Agency of Canada (PHAC) and Health Canada from over 56 million administered doses of COVID-19 vaccines" https://www.alberta.ca/assets/documents/health-myocarditis-and-pericarditis-following-covid.pdf