Shell vs. Solid Mesh

Hi,

I've made some test to decide which better mesh type choose, because my analyst friend said me that Simulation don't have good result with shell mesh.

I attach the result and the part (2010).

The difference is considerable.

I would like your opinion when use shell mesh.

Thank you and Marry Christmas....

I've insert parasolid part for no SW2010 users.

SolidworksSimulation