All the answers are incomplete because they don't provide the assumptions necessary to arrive at a complete solution.

A more complete answer would look like this.

>Assuming just gravitational forces both the lighter and heavier baseballs both would fall at the same rate and then reach the surface at approximately the same time. This can be impacted however by additional forces that may be present such as an atmosphere providing additional resistances based on the surface area, density, and total mass of each object.

Though even that is an incomplete answer.