Actually, that inspired a question. For writers, what's more valuable, authenticity or creativity? Or does that depend on the genre?
This strikes me as a bit of an odd question. I mean, authenticity and creativity aren't mutually exclusive; in fact, they work together: creativity brings a story to life, and authenticity keeps it believable. Finding a way to make something feel authentic
requires creativity to begin with; after all, if you're going to have a character do something like slay a dragon or forge a skateboard out of a chunk of the sun in order to skate through space, you need to think pretty hard to come up with a way to make that seem authentic.
I guess it depends on what you mean by authenticity. I'm interpreting it as 'aspects of a story that make it feel real', so if that's not what you meant then ignore everything I'm writing. It's fairly independent of genre; a story needs to be more than a straightforward recounting of the minutiae of everyday life (unless you're Proust, I guess, but if you're Proust you certainly shouldn't be taking writing advice from me), but it does need to remain believable to the reader. A reader shouldn't start thinking,
Well, this is silly halfway through, even if they are reading about the aforementioned solar spaceboard.
Er... I guess I'm just repeating what bobandbill said by this point. I'll stop, but after just this last observation: I think enough creativity brings its own authenticity. It self-organises: enough creativity and it tends to not only establish its own world and characters, but rules for them that bind them into a reasonable approximation of the real world, or at least into a coherent world that follows its own laws. That gives it its own authenticity, apart from that of reality - China Miéville, for instance, rarely sets his novels in anything approximating the real world, and never outright explains the laws of his settings - but they follow the rules and, almost without noticing, you adapt to the odd terminology and accept how the book works.
So, to conclude: authenticity and creativity are, well, inextricable. I'm not sure I could separate them into disparate parts of the storytelling experience.