The heavier one will hit the ground first. They will hit the ground at the same time. The lighter one will hit the ground first. Radio waves are much slower. They both travel at the same speed.
Radio waves are much faster.
Astronauts inside the Space Shuttle float around as it orbits the Earth because they are falling in the same way as the Space Shuttle. Imagine that the Earth's orbit were changed to be a perfect circle about the Sun so that the distance to the Sun never changed. We would still experience seasons, but the difference would be much MORE noticeable. We would still experience seasons, but the difference would be much LESS noticeable. We would no longer experience a difference between the seasons.