I believe (guess) the heavier one would accelerate to it's terminal velocity faster than the lighter one because the extra weight is always accelerating the aircraft toward the ground even in level flight, so it would reach the ground faster. Sort of like two cars raceing to a red light in a 60 MPH zone. Neither goes over 60, but the one that reaches terminal velocity the soonest gets to the red light first. If they were going straight up, the lighter one would win. I can only imagine the soon-to-come dozen pages of amusing yet ill-informed jargon. Not that I am any different
-Steve