Part of the problem is that the weakened form is used because it doesn't require refrigeration. So, the fully inactivated vaccine is the "better" of the two, b

Part of the problem is that the weakened form is used because it doesn't require refrigeration. So, the fully inactivated vaccine is the "better" of the two, but, because it requires refrigeration, is harder to deal with in the areas of Pakistan and Afghanistan where vaccination is most needed.