Contrasting the ideas presented in these two books is a challenge. The reason for that is the two books have minimal areas of overlap. True, they both talk about design but "Emotional Design" does not cover the same sort of information that "Design of Everyday Things" does.
The first chapter of "Emotional Design" spent a lot of time talking about how positive emotions help the user understand how a new device works easier and the ways in which emotions are derived in humans and other animals. In comparison, "Design of Everyday Things" describes how the users are not at fault when they do not understand the design and the ways in which knowledge is available for the users. As you can see, the topics are similar but do not exactly relate to one another.
My personal opinion is that there is no simple way to contrast these two ideas. They are not opposing sides of a coin, but two seperate coins. Both must be included to have a complete and fully understood design. The layout needs to be asthetic (allowing for good emotions) and functional (containing all the necessary particulars).
Attractive things will allow the user to understand how they work much easier, but well designed items mean that the user will not have to think to understand how the item works. While both pieces are necessary for the a good design, there is a slight tradeoff. An emotionally designed object may have labels which a well designed object would not need. Do you want to make an emtionally designed object, or a well designed object? There should not be a tradeoff between which design style is better; both are necessary.
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