Loads of people seem to have super variable experiences on tapas v webtoon, actually - it might depend on what you do, really? Romance and fantasy seem to do great but I really don't see a lot of scifi/action/horror on here.
I can yap on and on about image resolution all day, but PNG is best for web stuff as a general rule. But yeah! I'm glad something I said helped out, I'm real new to this as well so I believe in sharing what knowledge I've managed to grab at.