I’m currently working full time in comics and I will always always always say speed for a couple reasons.
1.) Speed is the way into a following. I’m sure there are outliers but for 99% of people this remains true. When I was updating my comic 4 pages a day every weekday I was getting followers in the hundreds everyday without fail. Early on when I was still trying to get my footing it was really clear to see how speed had an impact on audience growth.
2.) When you work fast, you work more and you end up learning along the way how to get the most quality in the shortest amount of time because you’re technically just getting more PRACTICE in. Sure, my comics aren’t as 100% perfect as I would like them to be but the audience doesn’t really care as long as they’re getting the content they want and they don’t know what MY idea of perfect is. And now I have a big graphic novel project with a publisher I love that I’m taking my actually time on and it’s easily the best looking comic I’ve ever done and it’s because I got the amount of practice I got.
3.) Deadlines.