As mentioned previously, a brochure website is just a smaller and simpler form of a business site. So, why would you choose to go with something smaller?
A main reason is the cost of the website set up. As the brochure site is a lot smaller, it is also easier and quicker to develop; therefore, making it a much cheaper option.
Another reason, bigger is not always better. Now, this completely depends on what industry you are in and what the competition is doing. However, as covered before, the more creative industries such as graphic design, photography videography and many more; benefit from letting pretty much just their work do the talking.