Wow. This tragedy is so unreal and horrific, and to read Nando's recount was truly an experience.
I watched 'Society of the Snow' a few months ago and have been fascinated by this event since then. In terms of whether you should read this book or watch 'society of the snow', I personally just enjoyed the pacing and layout of 'society of the snow' more, but would still encourage you to check this out because it's written by Nando himself and it has a lot of insightful passages about his inner thoughts during/after the 72 days.

Nando writes with full love and respect for his fellow survivors and for the people who died on the Andes. Especially love the way he wrote about Roberto Canessa, his trek partner- it was funny and provided a change of pace/emotions while reading. You can definitely tell they are friends from the way he speaks about Canessa. I started bawling when they all got saved and were hugging each other and when he finally got reunited with his dad. The epilogue was an appreciated extra touch; pages of Nando just gushing his admirations for his teammates and where they ended up in life. I loved the conclusions he came to about this event, relating to his religious beliefs and also his beliefs for why they had to go through all of that. 

Writing just needed to be a bit more succinct as it felt drawn out sometimes. Recommend this book to anyone who wants to have a little cry and also appreciate their life more.