Vampires have more complexity. And often better explanations. And sometime sex apeal. Zombies are a little boring. There is no such thing as a sexy zombie. Then there is "I Am Legend", with vampire zombies.
I have to admit to having a bit of a vampire fetish myself, but as my husband correctly points out, it's only more recent media and literary vampires which are sexy. The classic vampire was an animated dead body inhabited by a demon. The way they're written today, it's almost always the original person with something akin to a viral infection that's killed them physically, perhaps cut them off from their soul and/or redemption ("Dead Witch Walking" series) and made them an obligate sanguivore. :)
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Then there is "I Am Legend", with vampire zombies.
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That actually changed with Stoker ... There was another author as well ... but I can't think of the name at the moment.