The book is very different than the movie. The filmmakers said they only used a few basic ideas from the book for the movie.

I always enjoy the movie for it's satire. It was very well done as a "spoof" of the system it portrays.

The book is slower-paced and while it appears to promote the system it describes I'm not sure it does a great job. The ideas are presented well but to me it comes off sluggish and too wordy. The action of the movie has a lot more life to it than the book.

But, if you're just reading "for interest" then go for it. Just don't expect to make a direct comparison between the two.