The mRNA vaccine: A single RNA gene that produces one protein, the S protein.
The COVID infection: 20+ different RNA genes that produce many proteins, include the S protein.
The choice is between an RNA gene that produces one protein or the entire RNA viral genome that produces 20+ genes including the gene found in the vaccine. Any effects from the vaccine will also be found in the viral infection because both carry the S protein. If the vaccine has effects 10 years down the road then so too will the infection. In addition, no vaccine in history has had negative side effects that show up 10 years down the road. You are orders of magnitude more likely to die from the infection than you are to have negative side effects that show up 10 years down the road.
The viral infection has killed over 600,000 Americans, and that number includes people under the age of 18. The mRNA vaccine has not killed anyone.