The brochure and catalog are often mixed but designed for different jobs. The brochure convinces; it is short, focused and built around a single message. The catalog gives information; it presents a wide range of products or services in a regular manner.
The selection starts with purpose. If you are introducing a new service, announcing a campaign, or giving a short corporate summary, the brochure is the right tool. If you need to present dozens of products with codes and technical details, the catalog is inevitable.
Sometimes the two work together: the brochure awakens curiosity and shakes hands, while the catalogue supports decision with in-depth knowledge. The right choice is made based on where and to whom the material will reach.