Here are my top three…
First places goes to Minagoroshi for me. Satoko is one of my favorite characters and it was really awesome to see how things played out there. Then there was the ending of that chapter… It really stuck with me.
Then there’s Tatarigoroshi for the questions arc in general. This is basically the end of the questions arc (I, maybe harshly, view Himatsubushi as little more than a filler/bonus chapter), so we’ve accumulated a lot of knowledge and then learn something rather interesting at the end of the chapter.
Finally, I suppose Onikakushi, since it was the introduction to the series and just hooked me right from the start.