Most Helpful Guy
I'd recommend reading more. You can find new words to use and borrow certain aspects and styles from your favorite writers.
I'd say novels are more difficult to write because you do need to write more about the setting and the inner thoughts. Screenplays are basically a guide for the film that they're being written for. They can be descriptive, but a lot of what gets written may well not get put onto the screen. So most times in a script the description is generally just the setting and time they take place in.
Both are great for different reasons.