I am working on implementing a custom server application that should be capable of handling a very large volume of traffic.

I am aware that this type of question has been asked a lot, but I haven't been able to find a good answer. What I'm really looking for is for a server with given specs which OS will be able to handle a larger traffic faster and more reliably. I do not care about rights management or any other features.

I am fairly good with both platforms, and so I would like to pick the OS with better performance on a clean install, and with nothing else running.

Thanks in advance.