There are some adverts that sell a product against its competitors. But there are plenty that sell the idea that with a particular company's logo on a product you'll be fashionable. And, there are plenty that sell products that people don't need, at all, using the idea that the product will make your life more fulfilling.

We don't watch broadcast TV at home. 30 mins in front of a friend's TV and our kid suddenly 'need' a ton of new stuff. At the cinema "you should get that car Dad", etc..

It's psychological manipulation, it's rarely ever a helpful synopsis of a products comparative specifications.