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NFC cards are fairly quick and convenient, probably the most so before Apple pay came out. It did though have some downfalls, not that Apple pay doesn't have downfalls either, it is.
Generally though from my experience Apple pay is quicker than NFC cards.
For lower value transactions, Contactless cards will still be a little faster as they don't usually require authorisation from the bank, whereas Apple Pay does. This makes a big difference on dial up terminals.
 
I can understand Apple Pay being popular in the U.S. as they don't appear to have the security of chip and pin or NFC cards, at least not as a wide distribution, as far as I know.

Popular with Americans on MacRumors and other Apple forums/websites you mean. I don't really see NFC being used for the majority of transactions here any time soon since as much as some don't want to admit it, chip and signature is "good enough" for the vast majority of people.
 
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