I started Broke Ninjas (a gag strip) on both LINE Webtoon and Tapastic about the same time last summer. Just those two, since their Alexa rankings were highest compared to other comic self-publishing websites I saw out there at the time. In nine or so months, about 1,100 subscribers found my comic on Webtoon and about 80 have found it on Tapastic.
Webtoon does have a much larger audience than Tapastic, and by default their Discover page pushes comics with fresh updates whereas Tapastic's default pushes just the uber popular ones. So, it feels like readers are able to find new creators and comics easier on Webtoon. I haven't noticed the readers being any less supportive on one platform or the other. Maybe I'm just lucky, but BN readers are super fun and encouraging.
For monetization, Webtoon has that partnership with Patreon, but it doesn't really help that readers have to leave the app, create an account, and link an existing payment account in order to make a contribution. Too many steps. And for readers who are kids without bank or PayPal accounts, Patreon's not useful at all.
I like the new tipping feature on Tapastic a lot, and I wish something like that was available on Webtoon as well. But I know building and implementing something like that can take a lot of time and expense, and I don't know if Webtoon is keen to dive into that.
It's really encouraging, however, when I recently announced the tipping feature on both Webtoon and Tapastic, that some readers opened Tapastic accounts because they wanted to support my comic. I've said multiple times before that I intend to keep my comic free to read, so it's awesome that several wanted to jump on board with me and mitigate some of the expense that goes into making the episodes every week.
Anyway, that's what I've observed so far.