Your question is vague. Are the balls dropped and thrown at the same time? Assuming they are the down thrown will arrive first. You need to solve for t in the equation:
h-vt-.5gt2=0, where h is the initial height, v is the initial speed, and g is the gravitational constant. Air resistance is neglected - however, if both balls are the same the net effect will be the same on both.
For the dropped ball v=0 while the thrown ball starts with v>0, so t will be less.