Bread-Bakers v109.n024.7

I may have come to this discussion late so pardon me if I ask a 
question that has been answered.
To make pizza on the grill should I use a baking stone (pizza stone) 
or unglazed quarry tiles?
I realize that I can put the pizza directly on the grill ( - it is a 
gas grill - ) but I want to see how it works iwth the stone or tile.

Thanks in advance for all answers.
Stephen Blumm