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What would be the difference of stacking objects into each other and extruding by starting with one single primitive. How does it influence performance and what are the advantages and disadvantages using either of them?

For reference. Between this Image 1

and this Image 2

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RaideX
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    The intersection of the two meshes will be much harder to control, and you have extra geometry inside the cube. If you want to add any transparency or volume materials, this is a big no-no. – J Sargent Apr 02 '15 at 13:48
  • yes. This is understandable.

    Let's just say i will be using this as a low poly game object with diffuse, normal and spec map. How about that scenario?

     – RaideX Apr 02 '15 at 14:23
  • For texturing I'd recommend using one mesh, depending of course on the specific use case. – J Sargent Apr 02 '15 at 14:34
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    Also you would get really odd looking corner artefacts when light hits the intersection a certain way. – ruckus Apr 02 '15 at 14:41
  • those "specific cases" are what i'm looking for. When do i work with what? I just want to find out the most efficient way for my workflow. And the fastest would be just adding a new mesh and joining it with the original in my eyes. – RaideX Apr 02 '15 at 15:06
  • Select the face, press E, scale with S, and press E again. You may want to use different objects if the parts represented by the to separate meshes are distinct pieces, otherwise it is best to join them – J Sargent Apr 02 '15 at 15:30
  • @NoviceInDisguise Comments are meant for clarification. If you have an answer it's better to post it as one. – Ray Mairlot Apr 02 '15 at 20:26
  • Related: http://blender.stackexchange.com/q/3305/599 – gandalf3 Apr 03 '15 at 06:15

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I would recommend using one mesh. You can easily get the mesh you want in this instance by selecting the desired face, pressing E to extrude and then S to scale. Now press E to extrude again, and you have the desired mesh, created in three simple commands.

Modelling as one mesh

This method works in many other instances, even on N-Gon or Tri faces. This is a good general modelling technique to know for any modelling project.

J Sargent
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