Do you know advertisements? do you know recommendation? advertisements are promotions of products or services done by artist via TV commercials while recommendation is where promotions of products or services are advised mostly by people we know. so which would you prefer advertising or recommendations? ^^
I'd go for recommendation. Recommendation or "word of mouth" is the most effective way of promoting your product or service.
Nowadays, people are not relying much on the ads that they see on TV or read on the magazines or newspaper. They are most likely convinced when their friends or relatives tell something about the product and how they are satisfied with it. People who already bought or try the product will spread it out to their friends. That way, they help you promote your product. As a result, aside from increasing sales, you are also increasing your loyal customers.
I'd prefer the recommendation from someone I know.. Of course, If someone you know recommend a product definitely they have already tried and proved that the product is good.