it's worth also asking:
How much does licensing a set of Windows keys run?
How does the .NET GC impact me versus Swift's ARC?
How much RAM does Visual Studio eat up after you've been coding for a while?
How slow, unresponsive or buggy is it these days?
of course there's "ecosystem creep"... If I'm going C# on mobile, I'll naturally be influenced to consider C# on the server... how much do Windows servers cost? and since they're a "first class citizen" on windows, what about SQL Server?