Okay, to put it simply which way to write a book is better and more successful in the long run? A long chapter book.Or between volumes or different book titles?
Sorry if I didnt make it clear.
Thank you for answering me.
Like Nahrenne said, it doesn't have to be either way, but from my own observations, the longer web serials that can go on and on, having arc after arc after arc, (for example: most isekai & LitRPG stories) and which tend to have no single overarching narrative or "Great Big Bad" at least not for a long time, or just isn't named as such, like the Wandering Inn, Defiance of the Fall, Rupegia, and various of similar tales, they would fit better into the volume format than the traditional chapter book format, though neither of these three subscribe to the format or label their stories as such. Still, I would place them as writers in the volume format.
If you have a single overarching goal as well as the big bad guy/final boss/ etc. etc. already prepared, or just even have one at all really, chapter book format might be better, though in the end, it matters most how you intend to execute it. Is each arc going to be one self-contained arc that can be separated into a separate book? Or is the whole thing one long stream of consciousness? An example being, the way movies are done. You have the first movie, than the sequels. They normally have many of the same characters, but its obvious that each story is a self-contained arc even if they tackle similar issues and often sometimes, the very same group of antagonists. Or is it like manga where enemies and allies move in and out of the plot, either dying or not, but frequently being interchanged for others except for the most important of the lot. The movie example is best for chapter book format. The manga is obviously best for volume format.
I wasn't exactly the most coherent with my response, but I hope I got my point across.