RE:Astrazeneca shot becomes Canada's third approved vaccineThe Oxford-Astrazeneca shot is not the most effective for the variants of the virus. This is a great option for healthy individuals in their 20-30's. Perhaps they can modify it for the variants. Or modify it so that there is a vaccine for children. The best option thus far to cover the most variants, or in an older or immunocompromised patient would be the Moderna or Pfizer shot.
Curious to learn more about the Johnson and Johnson shot, it only requires one shot. I think it was just approved in the US.