What is the difference between continuous delivery and recurring delivery in Adobe Campaign?

Continuous delivery: 

A Continuous delivery type action lets you add new recipients to an existing delivery.At a delivery template level, you can specify a script to calculate the label (and the campaign folder) of the associated delivery. If the script calculates a delivery that does not yet exist, it can be created on the fly.

Benefits of this delivery type avoids you having to create a new delivery each time.

Use: This mode is often more efficient, in particular for low-volume alerts or notifications sent out as and when needed.

Recurring delivery:

A Recurring delivery type action will create a new delivery for every execution cycle of a work flow. This enables Adobe Campaign to create recurring e-mail messages. For example, you might want to send an e-mail message every month to remind a group of people that a report is due.

Benefits of this delivery type avoids you having to create a new delivery for recurring tasks.

Use: This mode is often more efficient, in particular for high-volume alerts or notifications or Reminders sent out as and when needed.

Difference:

The difference between a continuous delivery and a recurring delivery is in the way that the results will be managed:

• A Continuous delivery will create a single delivery. Add Delivery logs (broadlogs) and Tracking logs on to that same delivery each time that the activity executes.
• The Recurring delivery will create a new Delivery each time that the activity executes.
• Example: if you run the workflow once a month, you would end up with 12 deliveries after a year if you used a Recurring delivery activity but one delivery if you use continuous delivery.