I'd say that at this point the situation for me is pretty even between the two platforms, lol.
On Tapas, I have less subscribers (170), but way more views, likes and comments. Numbers increase very slowly, but the good thing is that people seem to be more willing to interact and leave a feedback 
On Webtoon, I have more subscribers (208), but... only 2-3 of them leave likes on my episodes. Everything else is just like screaming into a void. I tried encouraging people to comment and like episodes, asking questions hoping to get a response, I added bonus pics at the end of my episodes with a "please don't forget to leave a like" message, I tried to do banner swaps (out of 8 people I managed to put together, 4 ghosted me and 2 never did their part of the swap), I tried participating to events on Twitter and Instagram & tagging the Canvas staff on Twitter (always got ignored), talking/promoting on their official Discord (got downvoted once)... nothing seems to work to get more people to interact
for about six months, I actually kept losing followers with each new update instead of getting new ones.
I'm not giving up on WT yet because, in theory, it's where I got the biggest number of subscribers, but I have to say that so far I'm not very impressed with the place at the moment XD (btw: no, I do not participate in sub4sub).
Which isn't to say that Tapas is this perfect and flawless place where everything is beautiful and gaining a readership is easy, mind you
I still think that Tapas could improve some things for community creators (namely giving more visibility to events like the Discord community art board instead of just posting them as Instagram stories that only last 24 hours + more visibility to recently updated comics and novels on the app + pushing the "Tapas Community" socials more so that potential readers can see them, since right now the pages seem to be followed mostly by creators), but overall, I think that Tapas has a far more creator-friendly UI and gives you better ways to help you build a community compared to WT (creator walls, forums, Discord, NOTIFICATIONS). Also, it has less censorship compared to WT.
That said, trying out different platforms and seeing which one works best for you is always a good idea!