[SharpDX] Why does my model look better when using the deferred RenderTechnique instead of e.g. Blinn/Phong

Hello everyone,

When visualizing geometry in the sharpDX viewport, I noticed that all the edges are very jagged and not smooth at all.

Blinn Rendering

Deferred Rendering

This got a lot better when switching to the deferred rendering.

Is this normal? Is there maybe a way to improve the anti aliasing for the default rendering that I'm not aware of?