Taenia saginata (beef tapeworm) causes less serious infection than taenia solium (pork tapeworm), because -

Both beef tapeworm (Taenia saginata) and pork tapeworm (T. solium) can, in the adult form, cause disturbances of intestinal function. Intestinal disorder is due to not only direct irritation but also to the action of metabolic toxic wastes. In addition, T. saginata, because of its large size, may produce acute intestinal blockage. Unlike T. saginata, T. solium produces neurocysticercosis, which results in serious lesions in humans because of toxic byproducts formed (in T. saginata, the cysticercus--encysted larvae stage-- develops only in cattle).