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.

>>12
I've seen a case where a C# implementation of a C++ 3D game yielded a good improvement in speed. It just shows that a badly thought out design yielded poor performance, while a well thought out implementation in a higher-level language can yield better performance (be it C#, or more superior languages).