For quaternions both methods are equal in speed. This leads me to suspect that the AI method is performed on the GPU. For pathions, the AI method is faster by a factor of like 6.
I do like Marching Cubes LOL. The only drawback to the Python version is that it doesn’t perform iteration while calculating the vertex positions. I mean, it just does linear interpolation, which leads to blocky results. 
I have incentive to port my Marching Cubes code (based on Paul Bourke’s work) to Python LOL
Anyway. Thanks once again man!