On top of what Charles E Brown says, it's pretty easy for a single person to write a novel. It helps to have an editor and a publisher, but you don't need them.
Despite what we see in webcomics and daily comic strips in the newspaper, comic books and graphic novels usually take a whole team of people to create with any efficiency. Even if one person takes their time to create a whole graphic novel, it is a phenomenal amount of work, and involves an incredible amount of compromise (ask us how we know).
Movies are on a whole other scale than that, requiring entire groups of businesses and corporations to come together to create the spectacular works we're used to today. And they really skimp on the story telling, typically, with very thin scripts and slapdash world building if they're even original. Often times, they're based on novels.
Other mediums, such as radio plays, fall somewhere in between or around these primary examples.
Another thing a novel can provide that none of these other mediums do is the complex inner thoughts of the characters. Prose is particularly suited to divulging conflicted reactions, philosophy, and the brutality and beauty of language itself.
Finally, there's the difference in time taken to enjoy each medium.
A play or a movie is one and done, in the theater, one to two hours, at the pace of the production, and if it's good you walk away elated and very content.
A comic goes so quick. Reading it is super fast, and you don't really need to do more than to glance at a panel to get the gist of what's happening. But you can always come back to it to enjoy the artwork more, later. You can sit with it. But it's also kind of precious because of that. You don't want to get shmutz on it.
A radio play or an audio book is closer to a novel, typically, or is a novel, but you're stuck listening to it at the pace of the voice actors, again.
While a novel can come in many forms, doesn't necessarily have precious artwork bound up in it, and you can often read it just about anywhere. And it sort of demands a leisurely pace, if it's not a real pot boiler with lots of cliffhangers. You can reread the same paragraph over and over to try to understand it without someone yelling at you to stop rewinding it (usually). And you can take it with you to work and read it on the toilet during potty breaks.
It isn't fair to consider these mediums as competing endeavors. We have the capacity to enjoy them all, and they all exist. You can be reading a book all week, but go to a movie one night and read a comic on the bus on the way to the theater, then pick the book back up before bed when you get home, listening to a podcast on the way back.
That is, if you're not burnt out by having scrambled through college to get a decent career only to end up working overtime every week for the rest of your life. The feeling that these different things are vying for attention and taking it away from each other is sort of an artificial construct of the circumstances in which most of us live.
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