[ygra]

It depends. I mostly use PowerShell when trying out things with .NET, sometimes before or while I'm implementing them in C# as well. But depending on what I want to do, LINQ is a very nice thing to have, even though PowerShell has similar capabilities with the pipeline. (Can't really point to anything specific right now – there are instances when I prefer PowerShell and those where I prefer LINQ.)

One major reason might be speed, though. PowerShell can be very slow on large-ish data sets. And var in C# saves you from a lot of type-typing.