I get this question a lot. And I ask back “What business problems are you trying to solve?” Each method has great potential when applied within the right context. If you are already using one of them, it doesn’t mean that you can’t use practices from the other. You should adopt any practice that enhances your current toolset for solving business challenges.
Here is a good article that takes a pragmatic approach on how each one of the methods can be used based on what is best for your customers: What is Best, Scrum or Kanban? – http://www.agileconnection.com/article/what-best-scrum-or-kanban
CC Pace provides a variety of Agile services, and we can help you build your toolset as your business needs change. This blog site is a great forum to ask methodology related questions. What do you want to learn more about?