Witch and vampire dynamics are rarely just about rivalry in the books I've read. More often, it's a framework for exploring larger, more interesting themes. They're convenient, powerful symbols for fundamental forces in opposition—one representing ancient, primal blood magic and connection to nature, the other embodying cold, predatory immortality and the urban landscape.
A lot of urban fantasy uses this setup as a basic political structure, like in 'The Hollows' series. The conflict feels less personal and more like an allegory for cultural or class warfare. The real tension I look for is when a story subverts the rivalry entirely. My favorite moments come when a witch and a vampire are forced into an alliance, or even a romance. That's where the friction gets interesting, because their very natures—their magic systems, their relationship to life and death—are philosophically incompatible. The rivalry becomes an internal struggle against their own instincts, which is way more compelling than a simple turf war.
The undercurrent in a lot of these books, especially the romantasy ones, is a deep-seated distrust that's centuries old. It’s not just 'we don’t like each other'; it’s 'your existence is an affront to my understanding of the natural order.' A vampire sees a witch's power as chaotic and unpredictable, while the witch sees the vampire as a stagnant, parasitic force. That's a more profound conflict to unpack than who wins in a fight.