It's definitely worth it. It's worth posting everywhere you can, so long as you have the time and energy. If you don't need to restructure your comic to fit a specific platform, even better.
Currently we make three different versions of our comic; a full page for the website, vertical scroll for Webtoons, and vertical scroll w/ gif animations for Tapas.
Really, we only need to post on Webtoons as that's where we have over 600 subscribers (compared to just under 50 on Tapas) but I really like the quality of uploads here, as well as the community. There's also the chance, on either website, that you could be spotlighted by staff, which could bring in hundreds more subs. Even thousands.
That chance only exists if you're posting to the websites.