Wonder Woman, easily. It wasn't a retread made due to commercial pressure (Superman: Doomsday), an attempt to adapt a long and complex ensemble comic (New Frontier), or a scattered anthology with inconsistent art and writing (Gotham Knight). Just talented writers and artists working together to make a great movie.
The setpiece action scenes were terrific. The writing was clever and often surprising. The characters seemed real and human, and even the relationship between supporting characters such as Artemis and Alexa was portrayed in a touching way.
The WB take notes. THIS is how you can make Wonder Woman look cool on the big screen.