SolidWorks Plastic : Tetrahedral vs Hexahedral mesh

Hello

I hase some question about Mesh metode in SolidWorks, when I using solid mesh i found it have 2 metode of meshing. Tetrahedral Mesh and Hexahedral Mesh, the question is when should I use a Hexahedral Mesh and Tetrahedral Mesh in the plastic simulation

Thanks,

SolidworksSimulation