Graphic design is a specialist industry and it takes a skilled graphic designer to create something really beautiful and compelling. The right graphic designer will be able to produce good designs and will probably have had varied experience throughout their career, as they are usually highly creative and ambitious individuals. If you contact an agency, you will find graphic designers who are experienced across all industries and who will be able to get your branding and creative work just how you want it.
If you are involved in a more specific and specialist industry, you may want to find an agency that has experience in your field. This will give you the confidence you need as you will know that they are used to dealing with customers just like you. Don’t hesitate to ask agencies and designer about their experience. You will be able to tell a lot about them and whether they are right for you.