Aesthetics of the rest of the image / object it is on. Inverting allows you to have a black 'quiet area' rather than a lighter one. That being said, if you are

Aesthetics of the rest of the image / object it is on. Inverting allows you to have a black 'quiet area' rather than a lighter one. That being said, if you are putting QR codes on anything aesthetics are probably not something that even registers with you.