On the other hand, QR code payment systems only work while the user has a good network connection.

NFC payment terminals can work while the user's device is offline, like rural areas with poor cellular coverage. Not to mention tap-and-pay cards that don't even need a battery.

(Note: The few cases in the US I've seen QR code based payments, it's been for things like Alipay at a traditional point of sale terminal - which would also have a traditional card terminal with NFC reader. I could see QR codes being useful in other contexts, like paying a paper bill that came in the mail.)