It really depends on personal preference. DC often has darker and more brooding storylines, with iconic characters like Batman. Marvel, on the other hand, is known for its more relatable and humorous heroes like Spider - Man. In the graphic novels, DC might appeal to those who like complex, multi - layered stories, while Marvel could be great for fans of action - packed, fun - filled adventures.
One major difference is the tone. DC tends to be darker. For example, Batman's stories are often set in a gritty Gotham City. Marvel is generally more light - hearted, like the adventures of the Fantastic Four. Another difference is the character archetypes. DC has a lot of super - powerful, almost god - like characters. Marvel has more characters who are normal people with extraordinary abilities.
As a gamer, you can draw inspiration from the game mechanics you know. For example, if you're into RPGs, you can create a leveling system for your DC fanfiction characters. To start writing, research the DC universe a bit more if you need to. Look at different versions of the characters and their backstories. Then, begin with an interesting hook, like a gamer suddenly finding themselves in the middle of a battle between the Flash and Reverse - Flash.