When we look at the messaging space on Azure, we have a wide variety of options, each with it’s own strengths and weaknesses. For example, we have Event Hubs, which provides capabilities for processing large amounts of data streams, Service Bus for enterprise messaging, and Event Grid for reactive eventing.

In this blog post, we will look into the the Publish – Subscribe pattern, and how we could implement this using Azure services. For this scenario, we receive messages from one or multiple sources, which we need to route to one or more subscribers, based on properties or content. Of the different messaging offerings, two of these jump out for this scenario, Service Bus and Event Grid. Let’s have a look at when to use which, and the reasons behind these decisions.