That's a good point, but in the end it depends on what we want to achieve. If the goal is to just serve a small MVC application, we'd rather look at parameters like latency, number of served request, memory consumption and so on.
C#, like Java, leads with a wide margin in other context, like having solid frameworks for scalable applications. Giants use C# and won't stop any time soon. Even smaller realities like StackExchange use C#.
This test makes evident that you should choose the right tools for every task.
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