Comment by genthree

The list of potential cataclysms on Earth for which being on Mars would be preferable to still being on Earth despite the cataclysm is pretty short. Mostly amounts to whole-crust-liquifying (way, way worse than the K-T event) asteroids. For just about everything else, earthbound bunkers would be better.

Mars is so bad that you have to turn all of the Earth's surface to lava before it's worse than Mars, basically.