I really don't pay much attention to gender, but I read a lot of old Science Fiction which was in the past a largely male genre. Still, I've read a lot of Andre Norton, C.L. Moore, Marion Zimmer Bradley, Mary Gentle, Zenna Henderson and Ursula Leguin. And Connie Willis is one of my favorite.
In the fantasy genre, I tend to prefer male writers. Often female writers tend to have too much of a New Age influence for my tastes. (I blame my aversion on Mercedes Lackey.)
Still, there are female fantasy authors that I like, such as Katherine Kurtz, J.K. Rowlings, and Evangeline Walton.