Softneck varieties are the ones you'll see in the grocery store. They are easy to grow and store longer than hardnecks. Softnecks are fun to braid and hang your braids of garlic in the kitchen for quick and easy access. Most varieties have a milder, garlic flavor but they can still have quite a bit of heat. Heat develops in the cloves the longer the garlic is stored.
Softneck garlic is a good choice to plant in zones with warm climates in the winter. If you live in a cold climate you may want to consider growing hardneck types instead.