If you're eligible now, it will probably cost you 2-3 weeks at most to choose the one you want (it only cost me a day to pick pfizer though). It will likely be

If you're eligible now, it will probably cost you 2-3 weeks at most to choose the one you want (it only cost me a day to pick pfizer though). It will likely be a long time before you're able to get a different shot, so picking one that has more evidence for covering mutations, lasting longer, and being more effective in real world scenarios may well be the rational choice.