I would like to know which of WCF or .NET Sockets is the more efficient and the more recommended in a game developpment scenario.
Here are the different parts of the
If you want to maximize performance sockets is the way to go, WCF has both data and processing overhead. But... if performance is that critical to you, you should also consider assembler instead of c#.
WCF will handle 3-4 requests per second without a blink.
I would start with WCF, it will save you a lot of development time, no need to roll your own parser etc. You can concentrate on other parts on the game instead. If it actually turns our that WCF is too slow for your game you can throw WCF out and go for sockets instead.