Not parent, but I think it's pretty clear (at least) mRNA vaccines have not had "[testing] similar to other medications of a similar type," because they are quite novel and the first of their kind that has been approved for widespread use. (Aka they had testing, but not as strong historical real-world testing as others)

As for the other available vaccines, I'm not as familiar, but they seem more tested (although less efficient afaik). Although they also have their risks, especially for younger people, which one may want to factor in their risk/cost analysis.