Thank you for your interest in our application.
The only thing that we do not have in our application is the shopping cart, but we will have most probably in an year, after the 4.0 release.
If we should be the honest, both applications are great. What you will receive with Sitefinity though is the support - we will assist you with integration and development process. DNN has a strong community, but you wait for someone of them to respond you.
Other than that, we believe our APIs are easier to use. I do not want to say good words about Sitefinity and bad words against other products, therefore I invite the others to share their experience as well.
the Telerik team