It would depend greatly on why you are using it and how.
A wand, traditionally speaking, is measured by the length between the tip of your middle finger and elbow. Typically made of wood, they may also be made of crystal or metal tubing. Wands are used in both solitary and group rituals, and are aligned to male polarity. For this reason they are often use in Lunar celebrations. That said, sometimes they are specifically not used during new moons due to those being aligned to the Maiden. Some systems place the wand in the Air element, others place them in Fire. My preference is Air, given that Fire forges the sword/athame while Fire destroys wands.
Wands direct energy and do so very well. Staffs attract, absorb and concentrate energy and are used almost exclusively by Traditionalists in group rituals, typically used for Sabbat celebrations.
I hope this helped answer your question.