Comparison Visual studio 2015 and Blend for Visual Studio
<p>I am a newbie about Windows store apps development. What is the main function and benefits of Blend for Visual Studio.</p>

<p>There is already a XAML designer and all tools embedded in Visual Studio. Why there is a need for Blend for Visual Studio? What is the main advantage of Blend for Visual Studio? 
Because in many videos I watched, People prefer to use Blend for Visual Studio. Thanks.</p>

<p><strong>EDIT:</strong> My question is about the current Blend for Visual Studio version. I dont care about the older Blend versions. </p>