But screenwriting is so very different than fiction writing. Novels and stories are really different forms, but the screenplay is another elephant all its own. It takes years to learn fiction writing. I'd say dividing one's study up that way and trying to write in both fields would be very hard. I've tried the screen play.
Stories take one event and explores it and brings it to a conclusion.
A novel takes many events, characters, backgrounds, and complex ideas and weaves them into one cohesive whole. But other than that there's not a lot of crossover between novel and story techniques. I come to the novel for a broader and deeper experience. I love writing both of them very much. But the novel is harder for me.