We have evidence, in adults, of long-term effects from Covid. These effects aren't benign, either, e.g. permanent damage to the brain's grey matter. We have zero evidence of long-term side effects from the vaccine.
Ceteris paribus, infection is riskier than vaccines to adults. (I can think of zero diseases for which the vaccines are fine for adults and harmful to children and whose infections are harmful for adults and fine for children.)
This study is compelling evidence for creating an analog to the vaccine passport for the provably previously infected. It is not good evidence for intentional infection.
Getting the virus entails getting a lot more of the spike mRNA pumping out a lot more spike protein along with all the rest of the viral machinery and real infectious virions, infecting more cells than just in the muscle of your arm, attacking your heart, lungs, kidneys, etc.
Getting the virus is always going to be worse, for everyone, than getting the vaccine.
Which is also why people refusing to get the vaccine because they've been infected is dumb, because they already beat everything in the vaccine.
There are differences, and s-protein expression may trigger mild autoimmune disorders.