Most designers use Adobe Photoshop/Illustrator and some international designers use InDesign. The preferred method for building print ready Trade Show art files seems to be the use of Illustrator as the foundation where all text and shapes are created, and easily resized without any loss of quality. Images are adjusted in Photoshop, then imported onto the Illustrator document and positioned and sized.
We can accept all Adobe files, but we prefer PDF’s as they avoid the issues of linked fonts or images.