Although, if I look at this from which disaster is more interesting in the way it happens, and what causes it, then I'm not sure I'd find more interesting.
Thunder Snow
Tornadoes/Waterspouts/Fire tornadoes
Volcanoes/underwater volcanoes
Meteors
Whirlpools (Especially, when their "movements" become so strong that it stretches into the sky and "connects" with the clouds.)
Thunder and Lightening
Heavy Rainstorms
Cyclones / anticyclones, flood events and earthquakes, fascinate me the most.
But, we all need to be aware of any and all potential natural disaster events.