You can easily find sources with a simple Google search. I searched for "myocarditis risk of covid vs covid vaccine" and the second organic result is from Nature [1] and states:
> Previous research co-authored by Balicer found that in this age group, becoming infected with SARS-CoV-2 made a person 18 times more likely to develop myocarditis — a much more significant risk than is observed following vaccination.
Sources are in the article. You can easily find sources for COVID, please try searching it yourself first.