I think they each have their strenghts. A QR code allows immediacy and loudness, it's more spontaneous and fun. There's a mystery to it because it can't be read

I think they each have their strenghts. A QR code allows immediacy and loudness, it's more spontaneous and fun. There's a mystery to it because it can't be read by humans. A URL can be understood and remembered. It depends on what you're trying to do with the design. I wouldn't say a QR code is a substitute for a URL, it's more of an alternative. And it can be more than a URL.