The really nice advantage of Suica is its speed. Yeah credit card tap to pay is alright, but it's relatively slow, taking multiple seconds.

Now QR code payment seems to be taking off in Japan, but unfortunately you can't access it as a tourist.

There are several types of QR code payments getting introduced, so it would be interesting to know the specifics. I'm only aware of using a QR code for Shinkansen tickets, which is something I have used and something a tourist can use as well. And then there's the new tickets slowly getting introduced in some areas, where the paper ticket has a QR code. I've not seen those yet, but it sounds like just an ordinary ticket otherwise.