I honestly don't think there should be a debate
Any skill is HARD to obtain, is time consuming, requires years of development, constant learning, repetitiveness, patterns, grabbing any kind of resource and munch it like shredded cheese at 3 am.
Writing is hard, that's why I don't write and just focus on drawing because it is something that I already developed and had the resources for one at the time when I was originally interested in learning for both.
But on top of that, both will still have to develop skills like charisma, marketing, speeches, planification, leadership, fellowship, social interactions and more because one doesn't live solely of one single skill and makes it work for the rest.
But still, something that always bothers me is that there are always going to be those few (Or mayority) depends the case, of individuals that thanks to their lovely entitled behaviors the rest is put under the same bag and ends up generalized.
Like, I know a lot of writers who are amazing, with interesting stories, working hard, collaborating but at the same time there are times I see a few individuals, especially on my DMs that... kind of makes the rest to not look good on the spotlight and while one doesn't try to generalize there are certain paths that... just ugh.
Same for artists, you're going to find workaholics who barely take care of themselves, those filled with joy and hopes and then you're going to have those that literally are on another planet and saying nonsense or that just cry and whine so loudly because they can't get a commission despite of 10000 reasons why.
Like, yeah we all make fun or cringe at wattpad kids but then when we get disappointed with media we pridefuly claim that these kids could come up with a better ending for a series or better character development. Which is fun, not gonna lie but to a certain extent we're also denigrating both the professional skill and the amateur skill, despite well, good ideas doesn't mean there is gonna be good execution either.
And most of the time people don't see that a lot of things are scripted, like speeches, even trashy tv-reality is scripted, music, poems, commercials, even the topics of the news are scripted beforehand someone comments on it independently if we're talking about informatives, narrative text, a script, fanfiction, or whatever. Writing is writing, now, deciding to enhance that skill, that will differ from one person to another.
Either way, both careers, jobs, tasks, skills, hobbies, whatever you wanna call the art branches: drawing and writing. There is always going to be someone who doesn't value that skill, someone to screw up and make the rest look like clowns, as well for people who shows exactly that yeah this is hard work, woah the things that you can achieve, look how far you can get! And such.
I believe that the issue not only lies because of well, terms of technique, actual effort or whatever. But because it's more common heard to have illustrators being approached by some person who info dumps the lore of their story with the hopes of making a comic and become extremely rich and famous on their DMs instead of the same situation but inversed. (The fact that is not as frequent doesn't mean it doesn't happen and in both cases, I would slap whoever asks for free stuff like this)
I personally don't know which labour is more time consuming, if art or writing, I just know that it can take me an entire day to clean my house compared to someone else who takes a morning to do it. It all depends on the person and their circumstances.