I've read a fair bit that seems to suggest that the AZ (and I guess the other same tech ones - J&J) seem to be better at creating a T cell response, which AFAIK is quite long lasting compared to the antibody response (?). I'm no expert so I won't try and expound any further - I will just leave a link to an FT article here (and there are many others if you google.) I guess this is why there's so much thinking going on about mixing vaccines.
This seems to coincide with my own anecdotal experiences here in the UK that has lots of AZ vaccinations. When we were unvaccinated (through the first two waves but particularly during the second) I knew lots of people who got infected and also knew some people who died. This third wave (despite being a nastier Delta variant) feels a lot more remote as although there obviously are still a lot of infections according to the stats etc, I'm really not seeing much around me and I haven't as yet heard of anyone I know (even vaguely) being really ill, hospitalised or dying. (Lots of people are getting pinged by the app but that's a different discussion). Mind you, I don't know any vaccine refusers even among my daughters peer group who are all about 18. I do know of a few people who said they were going to refuse but when it came to crunch they all quietly seemed to change their minds.
Now, I appreciate this is completely subjective and I'm certainly not saying we're out of the woods so I'm continuing to be very careful (as I'd advise everyone else to be) but to my mind it's a great advert for taking up a vaccination. In my little bit of the world they seem to be working really well...
It depends on where you are, the response of your state and local government, your employment situation, and luck.
I only personally know two people that got COVID. My manager (and her family), and someone from my conservative religious circle. There are a total of 316 cases in my state right now and it has done well through the whole pandemic compared to the average state. My extended family is very cautious regarding health and, apparently, my neighbors are as well. This may have something to do with income and education.
If you can WFH, then you have advantages over people that can't.
My sister moved from MA to VT as she was rather freaked out at what was going on in MA - population density is definitely a factor.