https://www.reuters.com/business/healthcare-pharmaceuticals/...> surviving a previous infection now provided greater protection against the subsequent infection than vaccination
> Protection against Delta was highest, however, among people who were both vaccinated and had survived a previous COVID infection
So natural immunity is better than only being vaxed, but getting a vaccine increases your protection in both cases.
In order of protection:
1. cleared infection + vax
2. cleared infection
3. vax