I upload my comic in both formats, this is because I original uploading it to mangamagazine before moving here, because of that, a lot of fans who read the comic pages and were interested in only reading in that format followed me here (a lot of them HATE the vertical scroll format) plus I like the consistency and don't want to change the format in the middle of the comic.
Of the two versions the vertical scroll read does horrible on this website.
Comic book page format

Vertical format

(Webtoons I only have the vertical version, and it does MUCH better there with 2.7k readers instead of 272)
Even the Spanish translation of the page comic does better then the vertical scroll.

I also notice that people are more likely to comment on single page updates than full episodes.
Personally, I actually prefer the page formats (as long as the text is big enough to read. Some people use text way too small for the phone) in small single page (or 3 - 5) updates. Mostly because it's easier to keep track where I left of reading when the episodes are small. (my phone reading time is easily interrupted and tapastic doesn't save your place in the middle of an episode)
Also of note, I don't hate the vertical format, any new comics I draw are in vertical format because reformating pages to read in vertical form takes a lot of extra time that I just don't have, I'm just not going to start doing it for old comic that were created for other page format platforms.