Ask HN: Best book to get into iOS and Mac programming?

I've been eager to get into learning Cocoa and Objective-C. I do have some basic knowledge on programming because I've worked with Python before. So i was hoping you guys can help me out here with choosing a good book to assist me in Mac/iOS development.

I've been told that the following 2 books are great books to get started:

Cocoa Programming for Mac OS X by Aaron Hillegass (http://www.amazon.co.uk/dp/0321774086)

Programming in Objective-C: Updated for iOS 5 and Automatic Reference Counting (ARC) (Developer's Library) by Stephen G. Kochan http://www.amazon.co.uk/dp/0321811909

Can you tell me which one you think is 'better'? Feel free to make your own suggestions.

Thanks!