Suppose there were simultaneous global outbreaks of both zombies and body snatchers:
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Which group takes over humanity the fastest?
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Which group ends up dominating the planet in the long run?
Assumptions: -
Zombies: early-Romero-style stupid, slow shamblers for the zombies, with the following provisos:
A) A human must be directly contaminated (although a scratch will suffice) to become a zombie – i.e., forget the death-from-any-cause-always-creates-a-zombie premise (introduced in Night of the Living Dead but abandoned by the Dawn of the Dead remake).
B) Zombies are stupid, incapable of tool use more sophisticated than smashing in a window with a rock (a la the pre-Romero The Last Man On Earth, with Vincent Price), and utterly incapable of pulling off the trickier moves they pull in Land of the Dead.
C) Zombies are landlocked. None of this silly crap about walking underwater to reach an island or another continent, which smacks of zack biological revisionism and in any event implies an unzombie-like degree of forethought or determination.
D) Zombies can be “killed” or stopped only by destroying the brain or by total body destruction (i.e., by crushing, shredding or immolation.)
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Body Snatchers: Don Siegel/Philip Kaufman-style body-snatchers, in which the human victim has to fall asleep for at least a few seconds with a pod located nearby, say, within fifty feet or closer.
A) The snatchers’ intelligence (or instincts) is a shared, “hive”-style collective purpose and general understanding of how to propagate their numbers. Whether an individual snatcher’s intelligence is limited by that of the host human (or other) it takes over is… unknown, or at least debatable.
B) The snatchers are only as resilient or frail as their host species. Whatever will kill a human will kill a snatcher in the form of a human.