- MrMassakka
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- Noble Legendary Member
Biological, because you can do the least about it.
Many countries have a "shield" for nuclear missile attacks and a lot of institutions, even normal people remotely know how to deal with radiation and fallout. In addition to that, a stable cellar on a decent position can give you sufficient protection from the actual explosion.
Biological warfare however, is just... there. A dangerous airborne virus could make 99% of Earth's population extinct and no one could do anything about it.