The animation in "Ano Dachi no Tsumatachi wa..." is often praised for its realistic and expressive character designs. The characters' facial expressions, body language, and movements are all well-animated, bringing a sense of authenticity to the series. The backgrounds are also well-detailed, often reflecting the mundane yet relatable settings of a high school.
Ano Danchi no Tsuma-tachi wa (The Wives of That Apartment Complex) adapts a mature, slice-of-life drama about relationships, loneliness, and the hidden lives of suburban women; it succeeds strongest when it sticks to quiet character moments and realistic emotional beats, but it may feel slow or disjointed if episodes shift focus frequently.
Ultimately, whether Ano Danchi no Tsumatachi wa: The Animation is "better" than the original manga depends on personal preference. If you enjoy a more fast-paced, character-driven narrative with some changes from the source material, the anime might be the better choice. If you prefer a more traditional, faithful adaptation with a deeper dive into the characters' inner lives, the manga might be the way to go.