I've read both, and I greatly preferred "In the Plex". It seemed like a book that really had a thoughtful (if sympathetic) view into Google's inner workings. Levy's book drew from numerous interviews, and wove them together into a narrative that had structure, meaning, and was a great read.
"I'm Feeling Lucky" is a more personal book; It gets a LOT more into the nitty-gritty of personal politics, which can be interesting in a ValleyWag way, but didn't necessarily make me feel like I understood Google in a more meaningful way.
I got a lot of insight into Edwards' family, his mindset, and a much lower-level view into the Google offices.. But if you're only going to read one, read the Levy book.
Not directly relevant, but on the subject of Google in foreign languages.
Every time I visit a foreign country and use a local computer there, the default search language is in this local language (in spite of me being logged in into my non-local google account). One can click to search in English, but the next search is shown in this language again. And "google.com" redirects to "google.local country". If you stay abroad long enough, it is a great way to learn some Pavlov reflexes in obsessive clicking.
Definitely a first world problem, but if someone could let folks like me know how to address that issue, that would wonderful.
If you go to google.com you will get get redirected. But if you click "google.com in English", it will set a cookie and you won't get redirected anymore after that. At least that works for Germany and The Netherlands.
Article does not make me want to read the book -- all the anecdotes are about how his marketing education didn't apply to Google. Every one of his stories are "I told Sergey to do it this way, he didn't listen and was wildly successful."
http://www.amazon.com/Plex-Google-Thinks-Works-Shapes/dp/141...