A lot depends on how much personal control you have of when and what kind of vaccine you get. If you knew for certain you could wait 3 weeks and get your preferred vaccine, that’s probably better than taking J&J today. But if there’s a fair chance that you WON’T be able to—either you’ll have to wait much longer or take J&J anyway, you’re probably better off just taking it now.
The driving factor is just how much COVID-19 sucks, and the cost of getting it during that voluntary gap. If you’re truly comfortable and truly locked down, then waiting longer is more reasonable, and it also lets people who need it more than you get it sooner. In that case, delays of up to a few months may be justified. If you’re only mostly locked down (as I am—I still go out briefly a few times a week for things that can’t easily be delivered), then delay is riskier and you should prioritize any vaccine, delaying no more than a week or two.
A lot depends on how much personal control you have of when and what kind of vaccine you get. If you knew for certain you could wait 3 weeks and get your preferred vaccine, that’s probably better than taking J&J today. But if there’s a fair chance that you WON’T be able to—either you’ll have to wait much longer or take J&J anyway, you’re probably better off just taking it now.
The driving factor is just how much COVID-19 sucks, and the cost of getting it during that voluntary gap. If you’re truly comfortable and truly locked down, then waiting longer is more reasonable, and it also lets people who need it more than you get it sooner. In that case, delays of up to a few months may be justified. If you’re only mostly locked down (as I am—I still go out briefly a few times a week for things that can’t easily be delivered), then delay is riskier and you should prioritize any vaccine, delaying no more than a week or two.