From most of the studies I saw natural immunity was more effective than the vaccines - and both were (slightly) better yet. I say this as someone that got the

From most of the studies I saw natural immunity was more effective than the vaccines - and both were (slightly) better yet. I say this as someone that got the original strain and then delta - and both were quite serious. I remember at the time I got delta there was supposed to be about a 1% chance of me getting reinfected, though that study might have been pre-delta as I got it quite early.