In the scenario described, where there is no air resistance, the only value that will be different for the two objects is the velocity of the objects as they hit the ground.
Both the hammer and the feather will take the same time to fall due to the uniform acceleration of gravity acting on both objects. The upward push of air resistance is nonexistent in this ideal scenario, and the gravitational attraction between the Earth and both objects is the same since they are both being influenced by the same gravity field.
Therefore, the correct response is the velocity of the objects.