Visual Studio threads - afxwin or C++11 thread?

On Windows in Visual Studio 2013, I'm thinking C++11 threads via are better than threads because the code is then platform-independent (with compiler supporting C++11).

Could not find anyone discussing the differences between the two.

Wondering if there's any advantage to using afxwin.h, or if it's really just there for backwards compatibility now.

Not familiar with Windows programming, so concerned there may be some reason to stick with afxwin.h...