It is my guess, that mass has (little) or no effect on the downward force. This is surely true in a vacuum.
However, the retarding drag force would have more effect on a less dense object. The equivalence of inertial mass & gravitational mass results in cancelling of the mass in gravitational equations. This cancelation is not applicable to drag/lift equations of aerodynamics.
However, the retarding drag force would have more effect on a less dense object. The equivalence of inertial mass & gravitational mass results in cancelling of the mass in gravitational equations. This cancelation is not applicable to drag/lift equations of aerodynamics.