What's the difference between a pill bug and a sow bug?

Pill bugs and sow bugs, both represent of the order Isopoda,  and they are regularly found in gardens and in landscaped areas as they eat most on decaying matter. Although pill bugs and sow bugs play a compelling role in the action of decomposition, they can also be regarded as soil pests, most specifically if their population becomes larger. Expect minor damages on the young plant tissue and seedlings when there are pill bugs and sow bugs present in the garden. Pill bugs and sow bugs also feed on young roots, seedlings, vegetables, and fruits that are growing and laying on the soil as well as leaves located at the lower parts of plants. These scavenger species will dash out when they feel disturbed, often hiding under rocks, leaves, garden debris, and any damp areas. On some occasions, pill bugs and sow bugs can also be minor nuisances and annoying pests in the home, but will not actually do any damage to one’s house. Pill bugs and sow bugs cannot survive in a house for more than a day or two if they do not find any damp areas to serve as their homes. Moreover, these two do not sting or bite humans and other animals at home and are not at all dangerous. Despite a long list of similar characteristics, sow bugs and pill bugs have significant differences, too.

It's speed of rotation.