If you are concerned about the interest rate, which means you aren't paying your balance in full every month, no rebate or point deal is going to be worth a crap. The best rebate/frequent flyer miles/"points" deal doesn't even come to the equivalent of a 2% difference in interest rate.
If you don't pay in full every month, look for the lowest interest rate you can find, and don't let any rebate scheme confuse the issue.