> researchers looking at SARS-CoV-2 antibodies in people who had recovered found that the difference between the highest and lowest levels varied by a factor of over 1,000.
That study is seriously out of date, as it addresses the optimal strategy to prioritize vaccinations when the vaccines are scarce. That's still, sadly, a major concern in many parts of the world, but not so much in the US and Europe.
Since then, there's solid science[1] that hybrid immunity is significantly better than either vaccine-induced or disease-induced. So taking the vaccine is clearly the better choice whether you've been infected or not.
It's kind of moot anyways, infection + vaccine is better than just an infection.