I only have my comic uploaded on ComicFury and Tapas so far, and I think the amount of interaction is actually pretty even? °° I mean, on Tapas I have more subscribers, but on ComicFury I tend to get more comments. The ComicFury version also has A LOT more page views compared to Tapas (1394 vs 390, lol) though I feel the data on that one are not very reliable, as CF seems to count my own views as well as those of other people however, if we were to remove my own activity, the number of views would still be higher than on Tapas, so there's that
Should be pointed out that I only got started a couple of months ago and I have yet to find a way to promote myself that works well, but so far I'm satisfied with both sites haven't tried Webtoon yet... truth to be told, the things I read about the community on there (especially about childish/rude comments and trolls downvoting you to favor other creators) kinda scare me, so I'm still considering whether I should mirror on there or not ._.