The information density of QR codes is much higher.
In a few years many people will also be walking around with AR-glasses (e.g. google glasses) which may very well scan the codes automatically and overlay them in the viewport with whatever they want to represent.
In a few years many people will also be walking around with AR-glasses (e.g. google glasses) which may very well scan the codes automatically and overlay them in the viewport with whatever they want to represent.