It'd depend on your comic, but I can say that as a reader, I'm not usually a fan of 100+ panel long first episodes on webtoon. Reaching the end of the scroll and clicking to the next page gives me a second to breathe, digest what I just read, and decide if I like it enough to subscribe. If I have to wait too long to get there, I start skimming and feeling antsy. When I already know I love a series, I appreciate long updates, but for an introduction, I prefer three separate episodes.
Also consider that after the third episode, readers will get a pop-up asking if they want to subscribe. That's why so many comics begin with three complete episodes, then go forward from there with regular single episode updates per chosen period of time.
But this is a very slight preference of mine; I don't have a strong opinion either way. And either way, you know your work and what you wish to accomplish with it best.