Personally, I use a 2.625% cash back card with the "catch" being that I have to have enough stock in their subsidiary brokerage to qualify for the top rewards tier. Since I just buy and hold SP500 ETFs, this is an easy requirement.
State taxes, and county property taxes vary a lot fee-wise.
So in this case there was no saving, just a deferment of payment, but if the charge was 2.5%, 2.2% or 1.9% (like I did for something else), you absolutely saved some money besides deferment.
I am not starving for pennies, but using the card to get 2.62% back has become a habit and until recently the highest I had paid was 2.75%, the 2.9% was just yesterday for the first time and rather than think more about the impact, I just paid it.
Apple's credit card has always been unremarkable.
2% cash back is practically the floor for rewards cards. I've had a 2% rewards card for over a decade (Citi Double Cash).
People are able to get around 5% rewards if they're willing to be stuck with miles, locked into a specific retailer/company, or deal with rotating categories.