No studies, but my personal experience …
My post COVID symptoms began September 2020, before vaccine availability. Both my husband and I had the J&J initial vaccine, March 2021. We’ve boosted twice when eligible – first booster was Moderna, November 2021; second Pfizer, April 2022. Figured we’d get covered from all angles. We took all vaccines well. Unfortunately I am still symptomatic at 2 years, but neither of us have gotten COVID again, so there is that. We plan on getting the newest booster and flu shot soon, as last year.