Both will work. The xor version is an old trick that many years ago was faster to execute. I do not think that is still the case, but there is still the differe

Both will work. The xor version is an old trick that many years ago was faster to execute. I do not think that is still the case, but there is still the difference that the XOR opcode is only one byte and the mov version is multiple, so it saves a few bytes in the executable.