Go with the b flute corrugated boxes. If you want to save a little money, you can use clay boxes for your 10" pies of personal pan pizzas if you have them with out too much of a problem. As far as the other larger sizes, they are just too heavy for those flimsy clay boxes. Also if the pizzas sit too long in clay boxes, the moisture and grease will soak right through them. Another thing to look out for when using clay boxes, is when you stack them the top of the boxes tend to cave in. As a result the bottom pizza’s cheese gets stuck to the top of the box and you will have some unhappy customers and in the end you will lose more in business then you are saving by buying the cheaper clay boxes.