Is there a difference between wedding photography and graphic design? Which is more promising?

Wedding photography is related to the later graphic design, because the later retouching needs some skills learned from graphic design, but the retouching requirements of characters will be higher than ordinary graphic retouching, especially commercial films. The two can't say there is no difference, but there is not much difference. I suggest you learn the later stage, because you will definitely repair the floor plan in the later stage, but those who study the floor plan may not necessarily repair the portrait.