The most common use cases to implement using SAPO broker are :
What usecase you should use really depends on your application needs.
If want to implement a Queuing Messaging Pattern you should use QUEUES to publish your messages, because they guarantee :
Messages are stored and delivered only when consumers are available.
Every message should be acknowledge to guarantee that the message was processed. If the message is not acknowledge within a 2 minutes time frame then the message will be redelivered to any consumer on that queue. By default the delivery timeout is 2 minutes but if you need to change this time please consider the use of POLL operation instead of SUBSCRIBE.
To have the same guarantees of a QUEUE when consuming from a TOPIC then you should consume from a VIRTUAL QUEUE. When you are consuming as a VIRTUAL QUEUE you are asking to broker agent to copy and store all messages sent to that TOPIC and resend it to you as a QUEUE.