HornetQ vs. ActiveMQ

If I am looking to implement a production messaging server in an enterprise environment, how do I determine if ActiveMQ or HornetQ is the way to go?

I have developers that are already using EAP and we are looking for a general purpose messaging server to integrate tens of applications. The applications will only be exchanging several thousand messages per day, so it is not high volume.

I believe either will satisfy the requirements but want to better understand when and where I should use each Messaging Server?