<prompt> Human: Has anyone done the math on this? Which one is giving the highest payout per dollar spent?I see 3 points per 1! all over the place, but how much does that 3 miles get me for the different cards? If 3 points is worth .05 cents for one credit card, but only .02 cents for another... obviously I want the one that gets me more bang for my buck.I would personally prefer one that gets airlinetravel rewards, but if any reward card stands out over the others... well...Anyone ever done the math on this? Its hard to find an honest answer out on google.  <response>: I personally prefer cash back. 2 cash back on 15k purchases is 300 ... that can be used for anything including travel with any airline you like. 2 miles back on 15k purchases is 30,000 miles ... a free domestic ticket with limited availability on the airline associated with your card. 