Which Rod Transfers More Charge to a Metal Ball?

[duoheer]

Let's say we have a charged plastic rod and a neutral metal ball, and a charged metal rod and neutral metal ball, which rod can transfer more charge onto the metal ball? Or metal ball onto the rod (if the rods are positive)
Thank you

 

[Shooting Star]

How are you making them interact? Just touching one point of the rod to the ball, in either case, or in some other way?