Not that I have much in the way of chapterfics to show for it, but I know that I'm much more comfortable with the idea of finishing before posting, or at the very least having a rock-solid outline or first draft. I want to be sure I know where everything fits into place rather than discover it when I'm already in the thick of things—or worse, realize that I'm not discovering it in a timely manner, and then the story stalls while people are potentially already invested in it. And I'd rather know that I have a beginning and an end ready to go for a regular(ish) update schedule than leave people hanging in general, plotholes or no.
I can definitely understand the benefits of post-as-you-go, though! In particular I like the idea of getting feedback that can fix unforeseen plotholes and the like before they become a much bigger issue down the line. It's just that I personally am far more afraid of losing steam or direction while people are expecting updates than I am afraid of major problems. Not that a ridiculous plot problem couldn't happen, of course, but I feel like I'd prefer just dealing with it when it happens, yanno?