I can't believe natural immunity was ever in doubt. Is there a single disease for which natural immunity is not superior to acquired (via vaccine) immunity? I can't find one.
You're not supposed to ask those types of questions - you're not a scientist. Leave the health mandates and questions to the scientists that we trust to lead us through the pandemic.
I don't know if it has been studied much, but it stands to reason that a vaccine might impart superior immunity, especially considering variants and the fact that the vaccine is given in separate doses spread out long enough to induce more memory.