The TFA poster has great color and balance. Note how most of the blue is one side, while red is on the other. The red and blue sabers are positioned to create an arrow that helps draw the viewer upwards to the main character. The other characters are placed in a similar pyramid to help focus attention on Rey. Small elements like the ships and less important folks aren't distracting. Instead, they are set around the center, again pulling the viewer in and up. Over it all looms the obvious bad guy. At the top left, but behind the heroes.
In contrast, this Homecoming poster is a jumble. If you didn't know anything about it beforehand, it would be impossible to know who the bad guy should be. Is it Iron Man, or is he the main character? Birdman? Why is the monument sticking out of the harbor?