For me, it is The Stand. I’ve read it at least 10 times. Post-apocalyptic fiction is actually my favorite genre. My top five are, in order, The Stand,, The Passage, The Hunger Games Trilogy, Lucifer’s Hammer and Swan Song. My husband says I’m morbid, but I’ve been reading every post-aplocolyptic book I can find since I was in high school many, many moons ago.
I haven’t read The Passage, but I’ve read all the others, plus One Second After, Alas, Babylon and The Road. I have to say the entire list is incredibly good.
I never thought I’d enjoy Lucifer’s Hammer (I’m not into Sci-Fi), but what a great book that was!