If you are referring to Ecotech Vortechs powerheads then you probably meant ES versus WES? There is no Mp "W".
The ES is non-wireless version and has Ecosmart. And the WES has wireless communication and Ecosmart.
Sorry ...I should have made my question specific. I'm trying to figure out the difference btwn the old vortechs (the box version controller) and the newer Wes version