While I generally am in the classic camp, and plan to draw mine in that format, it's mostly about execution for me. While I've seen some BEAUTIFUL scroll-comics like The Firelight Isle, I don't like those that consist of a few panels spread out over vast white spaces like lost puzzle pieces. It just seems like cheap filler material to me, as if they're trying to fool me into thinking it's more than it really is. I care about the panels' relations to each other and the pacing, something which gets completely lost when dragged out like that. (Not that the classic format can't be abused, but I'm biased, okay xD)
To be perfectly honest, the reason I didn't bother with webcomics until last year was that all "webcomics" I clicked on on mangafox were of this "vast whiteness" format, and thinking that was how all were, I saw no reason to read those instead of professionally made ones. I'm so happy I found tapastic, and subsequently the wider webcomic community to prove me how wrong I was! : D