Out of all the appliances reviewed, the Oster Extra Large Air Fryer Oven has the largest capacity at 7 x 15 x 16-inches. Oster's oven is so massive that it can accommodate two 16-inch pizzas at once. That's big enough for the vast majority of standard-sized bakeware commonly used at home. It is only marginally larger than the Breville Smart Air Oven Pro and roughly an inch bigger than the Oster Digital French Door.