Telling Stories/Narration

This entire book of Never Let Me Go is just Kathy remembering what has happened in her life, separated into three parts: she tells the reader first about her time at Hailsham, then at the Cottages, and then what has happened during her time as a carer. This is similar to many other books, the one that I'm thinking of being one of my favorites, Looking For Alaska by John Green. The format of that book is unique because there are not chapters exactly, just sections with labels like "thirty days before" or "five days after" (which are centered around the pivotal event in the book.) There is a difference though, in how they approach this story telling. In LFA the narrator, Pudge, mostly sticks to telling the reader about what happened at that time, like normal chronological stories, however occasionally he will mention a regret that he now has about something that happened. In NLMG Kathy often jumps around in time or references something that she hasn't fully told the reader about yet. I usually prefer to read something chronologically, like LFA, because when something happens it makes more sense because I have already read about all the past events that have led up to and affected it. However, it can also be interesting to read a book written like NLMG, because at first I'm confused until the narrator explains something that they mention, but if I reread the book then I understand the references and make more connections about what caused certain events.
P.S. Looking For Alaska is a good book and I would highly recommend it