Force Mass Acceceleoration

Which one will drop first?

I think the 5kg medicine ball because of the mass inside of the ball the sand made the medicine ball hearyer as the basketball had air inside it to make it bounce more but have the same forces as the 5kg medicine ball.

Equipment:

                                                                      1x Basketball
                                                                  1x 5kg Medicine ball

Results:

Well? I was wrong the basketball fell down before the 5kg medicine ball it was a good discovery of both of the balls.  

Discussion:

I learnt about which ball dropped first and the forces on both of the balls I also learnt about the basketball I was surprised about the ball acording to my point of view I thought the medicine ball would drop first because of the weight inside of it.