I got H1N1. The only reason I didn’t end up in a hospital was because I forced myself to stay hydrated and somewhat lucid when I wasn’t able to sleep. It was really bad.
In comparison, I had corona last week and it was a walk in the park (I am also quad-vaccinated, that might have helped).
I can attest that somewhere between vaccines, potential acquired immunity and variants having reduced strength, my pair of confirmed Covid experiences (March 2020, July 2022) went from "the sickest I've ever felt, with symptoms recurring for months and persistent-to-present reduced smell capability" to "a mild cold".
Haven’t had Covid either, despite being exposed to it (our son had it) and we tested regularly for over a year too