I agree that zombies are more compelling than vampires... and I largely agree that it's because of their simplicity. Zombies are, in a sense, just far more elegant a "monster solution" than vampires.Richard Dansky said:Zombies Rule, Vampires Drool
When it comes to the great monster showdown, vampires may be popular, but zombies have the edge when it comes to scaring the pants off of us.
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So much of the vampire mythos is arbitrary. Why garlic? Why a wooden stake? I mean, there are explanations, depending on who you ask... but it's the fact that you need one. Zombies--killed by a shot to the brain. Makes complete sense. (Yes, both of them are reanimated dead, but that's one of those things that we already accept pretty readily as "just 'cause")
But really, I'd like to expand the idea of "monsters as disease allegory." You mention vampires as an AIDS-metaphor, and I can somewhat see that. Bit of a stretch, but one I could go with. Along those same lines, I think that zombies have a readily-available disease comparison: Cancer.
Cancer essentially amounts to a mutated cell, replicating uncontrollably, corrupting healthy tissue, and traveling through the body to spread elsewhere. Zombies? A mutated human, replicating (uncontrollably) by bites, corrupting healthy humans, traveling across the land and spreading the infection elsewhere. In both cases, time is against us. The problem only grows and spreads. Zombies are essentially cancer of the species. Pretty terrifying thought, really.