Look for award - winning DC Comics graphic novels. For example, those that have won Eisner Awards or other prestigious comic - related awards are likely to be among the greatest. Another way is to follow the works of well - known DC Comics creators. Their popular works are often considered great. For instance, anything by Grant Morrison or Geoff Johns is usually a good bet.
One way to find the greatest DC Comics graphic novels is to explore the back catalogues of classic DC characters. For example, when it comes to Batman, start with the graphic novels that are considered essential to his story, like 'The Killing Joke'. Similarly, for Superman, look for novels that define his character best. You can also check out collections or anthologies that feature the best - of from DC Comics over the years.
You can start by asking in local comic book stores. The staff there are often big fans and can recommend some of the greatest DC Comics graphic novels. Also, online comic book communities are a great resource. People there are always discussing and sharing their favorite reads.