I recommend them both. Rather than describing the book, I'm going to give you a few excerpts that stand out to me. If you find yourself nodding in agreement as you read them, you'll like the book. Interactivity craves meaning. It needs motivation, and it longs for emotional, as well as intellectual content.
Interface design is another way to think about experience, but interface is only half of it.
Interface is the end of experience, not the beginning. It is characteristic of interactive designers, especially those from the graphics disciplines, to think that interface IS experience. It is precisely this lack of understanding that results in interactive experiences that, although sometimes entertaining and even compelling, lack the kind of emotional power that we experience in films and even novels.