title: Microsoft.Bcl.Immutable vs System.Collections.Immutable.Net40
body: <p>What is the difference between these two NuGet packages?  Should I be using one over the other if I am creating a .net 4.51 project?  I've used the beta of the Microsoft.Bcl.Immutable in the past but just curious if one is going to be maintained better than the other or any pros and cons of using one over the other.</p>