Very good thread!

The biggest difference seemed to be between any form of quads and triangles.

 

By the way, there is a way to get similar types of triangles to delanuay in Wings... It just occurred to me. But you have to take it into account early in the model..  I used to remove these things while trying to preserve quads whiles subdividing... 

I don't have my poser computer available so I can't show it, but I will as soon as I get it back! It will not be exact. But you can get this effect quite easily by creating "hexagon" connected triangles while making the lower resolution mesh, then it will preserve this when you subdivide.  Beyond that you need to do some manual polish (But we do either way)   This way you can preserve the UV as well... 

Just a suggestion. Let me know how it goes. I will post some examples later on!