To understand why the 9780Z5 reference performs better, it helps to examine its engineering. The interface bridges the physical vehicle networks (K-Line, CAN-BUS, SAE J1850) with standard computer architectures.
The proper XS Evolution uses multiplexed hardware with physical relays inside the OBD2 box. As one expert noted, "the 9780.z5 is a Chinese copy, but if this one is with the correct hardware (optocopler/ic's) it works good, with the lexia/diagbox". The correct unit will have 12 relays on its main board. psa xs evolution 9780z5 better