There's an interesting angle to BLIK vs Wero. While I believe QR codes are more convenient it is actually possible to give BLIK over the phone. Which means that youngsters (or fraudsters ;)) have access to their guardians' money over the phone line.

QR codes are still less convenient when you're paying using the same mobile device you're using to generate the BLIK codes.

Doubly so when the phone is a foldable, so you can keep the bank open in a popup over the browser or app you're buying in.