I prefer Tapas on all fronts! I prefer the tools as a creator, I prefer how comments work, I prefer how the site looks, I especially prefer how the staff communicates, and I prefer how it doesn't totally garble my images. (Plus, they're nicer about horny content which is a plus.)
Webtoons is over saturated, highly censored, and the commenters can be extremely flippant or just kind of ignore that I'm a real human is making the comic they're reading, not just some big team. And, imo, Webtoons does a lot to suppress it's community made which always feels bad.
That all said, if you're making comics and you want an audience, right now you don't really have a choice. Use any and all platforms and see what sticks. Try Comicfury too if you want something more old school and way less censored than both platforms.