C# vs C++

I'm not looking to start some sort of fanboy arguement.

Is the ease in development brought by C# worth more than the power/speed of C++?

I'm writing a genetic algorithim so speed is pretty important.
I can't find any legit benchmark test so I'm lookin for oppinions here.

On behalf of C#, I have to say, that LINQ thing looks pretty interesting. But I never used it, so what the fuck do I know?