Specflow or BDDfy

I am looking to start using BDD in my next .NET project and I was wondering if anyone has experience using Specflow and BDDfy and which of the two they would recommend for a team that is new to BDD. This excersise will be a trial and if successful will become the BDD standard/best practice for future projects.

The team will be working with a QA and a BA, the BA will be responsible for writing user stories with the help of the QA. The QA might also help in writing the test stubs for the scenarios.

Thanks,

Chris