Sway is a short, crisp, amusing, and informative book about the psychology of decision making.
Nudge is a long, crisp, amusing, and informative book about the psychology of decision making.
Sway is written from the point of view of you, the decision maker. It warns of the importance of being aware of the ways you may be swayed, especially by those who are not benign.
Nudge is written from the point of view of the "choice architect" who has to create a driver's license application form, choose where to place which food in a cafeteria, or design an employee stock savings plan.
Thaler and Sunstein, the authors of Nudge, consider themselves paternalistic libertarians who feel it's appropriate to put the fruit at eye level in the junior high cafeteria and the cake and cookies above eye level and at the end of the table. Their point is you must display the food in some order and it's more useful to all of us when the healthy choices are more easily available than the french fries.
Both of these books are worth reading. If you're serious about increasing organ donations, preventing another disaster like the sub-prime crisis, improving the government drug plan for seniors, and other important situations where a small nudge might make a big difference for the better, then Nudge is for you. If you just want a very quick and very amusing overview of how we are fooled by salesmen and politicians and how we fool ourselves, Sway is just the ticket.
Not that I want to influence what you read . . .
Sway: The Irresistible Pull of Irrational Behavior (2008) by Ori Brafman and Rom Brafman 3.5 stars / 5 stars
Nudge: Improving Decisions About Health, Wealth, and Happiness (2008) by Richard H Thaler and Cass R Sunstein 4 stars / 5 stars