I've tried out both methods and here's my experience with either:
The pros of publishing multiple chapters at once is a captive reader. You'll most likely have them read everything you've published since, like you said, it's probably a full arc that has a beginning, middle, and end. At least if you're doing a linear story. Readers appreciate that sort of thing. Instead of having to wait for the next chapter and possibly not remember what happened previously if the gaps between publishing times is long, resulting in readers possibly forgetting about your story and dropping it entirely for something new.
If you're a like-whore, like me, publishing individual chapters has its pros. I noticed when I published chunks, some readers would only like the last chapter while during the period I started uploading individual chapters, they liked every individual chapter uploaded. So now, I'm not sure if they just didn't like the chapter for its content, or they didn't like it because it was uploaded as part of a chunk. It could just be conjecture, but it's a reoccurring thing for me that I experienced with multiple readers. It's not a big deal if you don't care about likes or use likes to analyze what your reader base is into, but MidbossMan had a good point that separate uploads puts your work on the front page more, for more exposure as well. It's why I switched to uploading individual chapters instead of chunks.
What I do currently is a combination of both. I still write in chunks and save them as drafts, but upload the chapters individually when I've reached the end of a short arc or scene. It keeps the scene consistent since it gives me a chance to proofread, while still getting that front page exposure time and making sure the gaps in uploads is short so readers won't completely forget what happened previously.