Shipping is free in all plans.
More light-weight items
More premium and heavier items
Candy twice a month
Either plan may include any items, but nami boxes will tend to contain more of heavier and premium items. For example when we send out special kit-kats again, they'll certainly be in a nami box.
When you order noodles in Japan, "shou" is a small portion and "nami" means a normal-sized portion.