For me It'd be (desc order):

Prologue, Chapter 1: Great opening, intrigued, great introduction to the game mechanics and choice-based driven story.

Epilogue: Great conclusion to the story, also tough fight and a rewarding cutscence at the end.

Chapter 3: I find this chapter to have a lot of interesting quests overall, with many interesting choices (especially the one in the brother!)

Chapter 5: Thrilling, fast-paced but a little repetitive

Chapter 2: I think it's all right, there is one or two interesting quest, but I don't feel that the weight of choice is prevalent on this one.

Chapter 4

I feel that chapter 4 at Murky Water is the weakest, due to a lack of interesting quest (except for the bride's quest but it's so clunky and I feel that it's not very well put togetheter). Also I find the backtracking for this chapter is outrageous!

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murky water, atmospheric as hell