from a physics standpoint, given that everything else is equal, the larger ball would have more rotational inertia due to its greater mass. this would allow it to spin longer when struck hard, which is good for those golf games and perhaps bowling games. the smaller ball with less rotational inertia would allow you to change directions more quickly, which would be good for games that require greater control, like centipede, etc. btw, dont forget to ALWAYS break in the bearings whether they are old, used, or new..