In laptops is MXM card better then onboard discrete chip?

DELOCK 61057 MXM to NVMe Key M Slot converter mxm slot NVIDIA MXM GPU cards are designed and manufactured by Advantech and fit perfectly in a space-limited system with excellent computing power slot demo gacor x500 MXM I6X PCI-Express NVIDIA' CeForce 6600 Go 256MB - WSXGA TFT Display Slot ~ 6 Hours Battery Life; Weight only Lbs

starbust slot Pictured: An MXM-based Nvidia GeForce GTX 770M inserted into the MXM slot of a 2010 ″ iMac logic board An ATI Radeon