I've read both and they are excellent. OSA gets you thinking in a prepper mindset and The Road makes you think about long term survival knowledge.
Aside from Left Behind (couldn't get into it) any other suggestions on other similar books that are decent?
Patriot Dawn?
299 days?
Lights Out
Patriots: Surviving the Coming Collapse
"I feel sorry for people who don't drink. When they wake up in the morning, that's as good as they're going to feel all day."