I think this real world data from NSW Health says it all about vaccines:

Essentially, you are far, far less likely to get covid if you are vaccinated – about 1/12 the rate of getting COVID.

Similarly your risk of ending up in ICU or dying is amazingly low with vaccinations. Its about 1.6% of vaccinated people who get COVID. In comparison, its 2.8% of unvaccinated people who end up in ICU or die.

Overall, that is a 17x reduction of serious illness or death with vaccination.