I’m hoping that when my now 16 year old is mandated to take the vaccine, that she’ll be eligible for either the Norovax or the J&J (if they can fix their clotting problem for young women).
If J&J makes any significant changes to how their vaccine functions, they’ll need to restart clinical trials on it. I wouldn’t count on that. Further, J&J used fetal stem cells for R&D and testing, so if you’re pro-life, also a non-starter.
Novavax used ethical cell lines for their R&D and testing. The mRNA vaccines did as well. If AstraZeneca/Oxford ever get approved in the US (and I don’t think they will), they also used fetal stem cells for R&D and testing.