Both volcanoes and earthquakes are very deadly, and they both rack up a total of deaths. Volcanoes being a eruption of molten rock that spreads then dries, earthquakes being the movements of the plates underneath the surface. There are some things the same about the two, like how both are results of faults in the earth. Volcanoes are many threats in one with magma, ash, and deadly gases. Earthquakes are a large shake and falling buildings.
I side with volcanoes, Volcanoes create ash clouds that block sunlight and can affect health. ( http://education.nationalgeographic.com/