Blend and VS are approaching each other, but both have their own audience. Under them both work on the same engine. Visual Studio is aimed at developers, while Blend is aimed at user interface designers. This does not mean that you cannot achieve great Blend functionality in VS and vice versa, it just is not optimized for it. Designing animations, storyboards, setting behaviors ... in Blend, everything is simpler. Other development functions are easier in VS (debugging, server connections, source control, UI source control, ...). Both are very strongly connected, you can switch between them.
WPF Tooling in Blend and Visual Studio 2015
Blend and Visual Studio - Why Two Tools?
Designing XAML in Visual Studio
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