It depends on personal preference. Some people might like Marvel superheroes more for their diverse powers and relatable characters. Others might prefer DC superheroes for their classic and iconic status.
One good theme is Bruce's training and how he became Batman. Fanfics can explore his travels to different parts of the world to learn various martial arts and detective skills. This can include his time with different mentors and the challenges he faced during his training.
Other than Sun Wukong, there were no real superheroes in Chinese literature. Sun Wukong was a character in the ancient Chinese novel Journey to the West. He was an immortal with extraordinary abilities and possessed the supernatural powers of 72 transformations and somersault clouds. In Chinese culture, there is usually no concept similar to American superheroes. People usually regard superheroes such as Superman as fictional stories and mythical characters. Although there were some characters with magical powers in Chinese literature, such as the ghosts in Strange Tales from a Chinese Studio, they were not given the role settings of superheroes.
Overall, Gotham has some similarities to the comics, but it also makes significant changes to characters and plotlines to make it more unique for the TV series. For example, some characters' personalities and backstories are altered.