QR code on the wall is probably better in this case because it's easier to spot from a head mounted display. The barcodes on wristbands are used mainly for pati

QR code on the wall is probably better in this case because it's easier to spot from a head mounted display. The barcodes on wristbands are used mainly for patient ID when administering medications, where the user is close to the patient. Being able to walk into a room and look at the same place each time has the advantage here.