Aristotelian theater can also be considered as "classical theater," which emphasized on the action in the play and in the theme. In the Aristotelian school of theater, each subsequent action has to contribute in progressing the narrative. The play also has to place an emphasis on articulating the theme of the story, which is the guiding force of the actions in the plot. It also encourages minimal subplots that complicate the overall arch of the story.
Brechtian theater, on the other hand, is a more experimental style that has its roots in German Expressionism and Marxist theories. Bertolt Brecht, the originator of this style of theater, believed that a play shouldn't focus on realistic portrayals of people and scenarios, but should stimulate the audience intellectually. This meant that the Brechtian-style play should break the illusion of the production, and remind the audience that they are witnessing a simulacrum on stage. Brechtian theater encourages multimedia ways of telling the story, such as interacting with the audience, or singing in the middle of the scene to emphasize an idea or message.