visa_paywaveEvery time I make a purchase, I can choose to use either my MasterCard or my VISA card.

The VISA card is PayWave-capable. All I have to do is wave it in front of a sensor to make a payment. Easy.

All else being equal (same fees, equivalent loyalty programmes etc.) guess which card is used more often?

(MasterCard has something similar called PayPass, though not in Singapore.)