While both graphic design agencies and freelancers have their pros and cons, hiring an agency is sold with some very distinct advantages.
The combined experience of an agency is just a big advantage for a customer as graphic design agencies will have teams of staff looking after having a job, which means there won’t be any danger of sick staff postponing a deadline. Agencies will even have more experience than freelancers in dealing with large clients and accounts and will usually have a lengthy listing of satisfied clients. Another big advantage of an agency is that because of their size, the agency teams can come up with a broader selection of ideas when compared to a single freelancer can. A style agency will have access to better resources a freelancer with an increase of extensive industry contacts and better equipment. Brochure Design
The actual advantage of hiring an agency is that you generally know very well what you’re going to obtain, while freelancers are more unpredictable. I don’t speak for all freelancers in my experience almost all are after big chucks of money and often don’t think about the client’s needs to the same level being an agency.
Graphic design agencies hire accounts people to cope with clients and manage expectations while a freelancer is more than probably be a developer in mind and are often not great at building client relations. This may result in missed deadlines and unreliable work ethic. I don’t speak for all freelancers of course but there might be no doubt that agencies are better organised.