depends on the room you have. our place is tiny, so we have a kids 16oz and a regular 20oz(one lid for both). look at the pricing scale. which size cup will profit the most? not necessarily the jumbo. we charge 1.25 for the 20 but couldnt charge more than 1.49 for the 32, so the 32 was out. for shakes, we were charging 225 for the 22 oz, 6 yrs ago, at steak n shake. hand dipped versus machine made, are more valuable, and more tasty.