I like both, but I've always leaned toward science fiction myself. I have an easier time finding deep and thought-provoking stories in the science fiction genre, and I tend to prefer its more emphasis on exploring what its possibilities mean and using them to examine ourselves.
I've been scratching my itch for fantasy with Chinese cultivation novels, it's like a refresh of the genre with a different mythological basis. And cultivation is fun, its like rpg levels but without the weird quasi rpg world of Japanese stuff.