While WooCommerce Memberships works very well on its own to help you sell set-length memberships, it’s very tightly integrated with WooCommerce Subscriptions to let you sell recurring memberships, as well as take advantage of some additional features that Subscriptions provides.
Subscriptions allows your customers to upgrade, downgrade, or pause their own subscriptions, which will also affect memberships associated with the subscription. You can also offer free trials and recurring billing (instead of set-length, expiring memberships).
