As a creator I’ve never tried doing scroll - format and I don’t think I plan on doing it since I’d like to print my stuff in the future. Also, When you do scroll format, you can’t really appreciate the art of paneling in a sense. You can do cool things in scroll format, but you wouldn’t be able to see the how panels fit with each other, the form of a page, the juxtaposition of panels.. (and cool things like the “page-turner”). I guess what I’m trying to say is that it becomes a WEBTOON and not a COMIC or a graphic novel. And personally I wouldn’t call my comic a webtoon.
As a reader, I like both but probably prefer page format since that’s kinda what I grew up with and am used to. ¯_(ツ)_/¯ the nice thing about vertical scroll is that you’re really being spoon-fed the story. If you’re handed a huge page with speech bubbles and panels and characters everywhere, it might be overwhelming and it’ll feel like a chore to read, ESPECIALLY if you’ve bookmarked multiple stories at once. With scroll, you can really go at your own pace. The panels are nice and spread out- one flick of the finger and you can get to the next picture. So I get why this format is more popular. Scroll format is in all the social media apps either way.