Haven’t read Little Elixir and OTP Guidebook yet, but i can highly recommend Elixir in Action, i found it amazing. Of course it won’t hurt to read both, which is my plan hehe.
msambarino
Onor.io
So you’re asking for a specific answer to a general question?
A lot of us in the Elixir community know both Ben and Sasa and they’ve both helped out a lot. Hence if you ask us to recommend one book over another,
a.) We’re reluctant to hurt anyone’s feelings
b.) Both books are pretty good.
Flip a coin–it really doesn’t matter which book you get because they’re both good introductions to the subject.
–
Onorio
3
kblake
I agree with others… get both. Keep in mind, it looks as though some bug fixes did not make it in “The Little Elixir & OTP Guidebook”. I’m sure once those make it in that book, it will be rock solid! Looking forward to it. 
1
mkunikow
StevenXL
I’ve worked through a large part of both books, and you simply can’t go wrong. Elixir in Action is a bit longer, and is divided into three main sections - The Language, The Platform, and Production. I think that The Little Elixir and OTP Guide is much more focused on the second part of those sections - i.e., OTP. Hopefully that helps you make a decision.
3