Need Help! cnc laser cutter

hi people of this great forum. i am from algeria and iam new to this field of cnc . i work as a jeweller and i need precisin in cutting thin copper sheets of 1 mm with the width of 1 mm i made a steel cnc that is great with no backlash at all all what i want to ask now is who is better in precision cutting the laser head or the spindle ?
i forgot to mention that the work area of this cnc is 30*40 cm
i am waiting for your suggestions and thank you all in advance