The WPF browser control is pretty weak. You don't have great control over which rendering engine it will use (default is to go to IE 7 mode!) except via writing a registry key to switch it. It provides almost no bridge between the JS and native code as well. I haven't used CefSharp, but I have used Awesomium, which provided pretty good JS-C# bindings, so I assume CefSharp has at least working JS-C# bindings.