Next year, two superhero movies will debut a month apart from each other. First, in March 2019, Captain Marvel (starring Brie Larson from Disney) comes out. Captain Marvel will most likely be compared to 2017's Wonder Woman. These films will undoubtedly be compared to each other and due to the history of the name, "Captain Marvel," at both Marvel and DC, Captain Marvel has higher expectations.
Shazam has had some major build up as well. It has been said that Shazam, because of its relatability of the storyline and the characters, is set up to do slightly better domestically. However, Captain Marvel is set to do better globally. Historically, Marvel has done better.