Who wud win ?
While most people just say zombies or vampires, I would begin by considering their strengths and weaknesses. Zombies: Strengths: Their numbers greatly outnumber those of the vampires. Their infectivity seems to be, perhaps, 99% and is easily spread by bites, wounds, and even air, water, and food. They're also extremely durable, being able to take gunshots to their torso, survive without blood loss since their blood is coagulated, live without food, water, or air for an indeterminate amount of time, survive in relatively extreme temperatures, experience limited fear, have very powerful jaws and arms, and early stages of infection show limited intelligence and running skills. They also seem to be only killed by decapitation (but the head can survive on its own, albeit unable to move) or by destroying the nervous system to inhibit movement. Again, most of all, their numbers greatly exceed the vampires. Weaknesses: Their speed. Once their brain deteriorates, their motor functions greatly decrease and they ramble around. They are unable to create a coordinated attack and zombies that live for a decade or more become useless. Vampires: Strengths: They are just like humans, capable of very complex thinking, but they have superstrength, superspeed, night vision, superagility, sharp talons and teeth, and some can fly. They can use weapons, create intricate battle plans, understand the enemy, and coordinate a civilization. They also seem to have rapid healing, able to take conventional attacks that would be lethal to humans such as blunt force trauma or slices to the body. They can also use weapons and are experts at stealth attacks. Some can also transform into bats, therefore zombies wouldn't attack them. Weaknesses: Their numbers are very low, as suggested by their infection rate to be less than a percent. When bitten by a vampire, the victim usually dies and only compatible genetics can create a vampire. It seems as if creating offspring is a slow and usually unsuccessful process, although science seems to remedy that. They require blood to survive indefinitely, so the more zombies made, the less supply they have. Furthermore, they seem to be very weak to holy water, fire, sunlight, and silver bullets, but thankfully zombies can't understand to use holy water, UV light, silver bullets, and fire. Of course, these qualities are all based on my personal thoughts. In the end, as much as I prefer vampires, zombies would win due to sheer numbers, the inability to die naturally, and brute force. This battle is synonymous to the Battle of Thermopylae, except imagine the Persian force to be in the billions range. Despite their technological advantage, vampires would be killed sooner or later due to their lack of blood supply and offspring unless they can develop a self-sustainable world to live in underground. I imagine they could, but since this is a fight to extinction, the vampires would lose. Unless they live long enough in isolation to create superweapons that can obliterate the rest of the world.