Originally Posted by joelmeu

When people post an unconstrained question like this, it's usually because they haven't done the research to know that "best" is a function of X, Y, and Z. So, by not specifying X, Y, and Z, they're indirectly asking for help understanding that too! : )

For example, from my research, I happen to know that the best rewards credit card (measured in the dollar value of the annual reward) for a person is largely a function of their spending profile -- specifically, how much they spend per month in various rewards spending categories like gas, grocery stores, drug stores, restaurants, office supply stores, home improvement, travel, etc. Additionally, for the frequent flier, the best credit card is also a function of how many miles one flies, one which airlines, the kinds of flights on which they'll redeem their miles/points, etc.

I haven't researched debit card rewards programs, so I don't know what the inputs are to the "best debit card for me" calculator. From what y'all know, what are the most important inputs?