VS 2013 MSTest vs nUnit vs xUnit

I realize there have been a LOT of questions on this topic but somehow I haven't found one that addressed my needs.

My team is looking to start automated Unit testing our application. We have never done it before and nobody on the team has much experience with it. I have been asked to research and find a framework for automating our Unit Testing. So far, I have narrowed the choices down to MSTest, NUnit and xUnit.

All across the internet, I read negative reviews about MSTest but it seems the most convenient tool to me for our purpose.

1) Our application is .NET

2) We use licensed VS IDE for our development across the team.

3) Source Control is Team Foundation Server 2010

4) We plan to integrate CI/CD as part of our software delivery process.

I feel that MSTest integrates right into this setup and provides the cleanest interface for us to work on. Is there a significant advantage with NUnit or xUnit over MSTest that we should consider?