Well, there’s a little of anecdote in my impression. Here in Canada, at least, where we had contactless credit cards for a while - meaning that virtually every retailer was already ready for payments via smartphones. Only a few banks provided the service - less than the “Big 5”, the five major banks in Canada - so even if you had a phone capable of doing it, you would have to also be a client of one of the few banks offering the service. As a result you wouldn’t see many people putting their smartphones to the machine to pay for stuff. Then Apple released Apple Pay, and within a week all Big 5 claimed they would support it, followed shortly after by most banks. Shortly after the new iPhone was in the streets, you could see people paying with their phones a lot more - iPhones and others.
But that story, as amusing as it is, is no data, I must agree. So here’s some - not from Canada, but still valid:
Check the data on the very last part of this infographic:
Apple Pay has more users than Samsung Pay - even if there are more Samsung phones than iPhones.
Check the number of countries where Samsung Pay, Apple Pay and Google Pay are accepted. Apple Pay is almost double Samsung Pay, that alone gives a clue about who could make it mainstream.
Again, according to the table in the article, Apple Pay has more than double the usage of Samsung Pay
If you are in the US, you might not have had the same impression - as I remember, it took a while for even credit card contactless payments to be a thing there, let alone upgrade all machines to accept smartphone contactless payments.