The features for Best Buy seem to be more product oriented. There is information displayed about specifications and pricing. This is good for people who want to research products before buying them.
Circuit City is more category oriented. The navigation is repeated on the main screen and all items are always mentioned in the category they are described as. This is helpful for people who want to buy something, btu do not really know what style or company they wish to purchase.
Audiences
Best Buy and Circuit City are two very big named electronic stores that I often compare as rivals. They both want to be the biggest electronic store selling the most merchandise, and both have extra support services. Because both websites themselves want to take customers away from eachother, they have developed similar styles and layouts in order for consumers to navigate both sites with little or no transition.