If you are serving pulled pork and chicken quarters be prepared to see a lot of waste.
It is human nature to pile the plate because the food looks good and they want to eat everything there. Soon before the plate is half finished the stomach is full...
I would go with individual pieces of chicken, they can always go back for a second piece if desired.
I found that servers also help to minimize waste, we let everyone go through the line once and then let people come back for seconds on their own accord...
But you have to decide what is best for you and the organization..
Humphrey's DownEast Beast W/BBQ Guru