Hey,

• A full stack developer is an engineer who can handle all the work of databases, servers, systems engineering, and clients. Depending on the project, what customers need may be a mobile stack, a Web stack, or a native application stack
• The main difference between graphic designers and full stack designers is the medium. Individuals in the Graphic Design field often have more freedom because they are not restricted by programming, resolution or speed.Full stack  professionals have to balance good design with speed and efficiency for the web
• Graphic Design involves creating graphics, typography, and images to present an idea. Most of the time you will find Graphic Design in the print industry, but they are also found in web projects as well. Graphic Designers create digital graphics, which  then are turned into brochures, posters, or whatever branding materials are required of them. Graphic Designers do not do any programming. They are responsible for making graphics which can later be used for published print work or even websites.
• So it depends on your interests and talents both the things have good career opportunities