^^Blender vs POVray.

I find that each program is useful for different things.

In POV you can script up anything you desire with little fuss (great for science), render thousands of instances of a complex object, have radiosity in your scene, etc.
In Blender you can render hair, SSS, make games (the new GLSL stuff is really cool), etc.

Povray is just a Renderer, Blender is what you use to actually make your scene.

As such, you can actually use Blender and Povray together, but you can just use Blender on its own with its built-in (But slower) renderer.