I don't have the exact information. But you could try looking on the Comic Con website or the Game of Thrones official channels for any news about their presence at Comic Con 2019.
Overall, the A Game of Thrones comic does a decent job. It visualizes the complex plot and characters effectively. Some details might be simplified for the comic medium, but it still retains the core of the story.
For me, the graphic novel is better. It has more room to develop the complex characters and storylines of 'Game of Thrones'. The illustrations are often more detailed and can really bring the world to life. The comic, while still good, can sometimes feel a bit rushed in comparison. However, if you're short on time or just want a taste of the 'Game of Thrones' world in a more bite - sized format, the comic could be a great choice.