Read both books a long time ago. I thought Rand's book was a bit depressing in parts, while Lucifer's Hammer was pretty much upbeat throughout....maybe even too much so. Was it a bit optimistic for Tim Hamner and his girlfriend to drive all night in their car on the railway tracks without the grade even once dropping below water enough to stop them? What the hell...it would have wrecked the story...
Ayn Rand thought that the working person (tradesperson, for example) was infinitely replaceable - that the creative spark was the only thing that mattered.
What a load of crap.
She convinced her husband and best friend that she (Ayn) and her best friend's husband ought to be able to have sex with each other - even if it hurt the feelings of her spouse and best friend.
What a bully.
Her books are ok reading, but her philosophy sucks ***.