Debit card and credit card seems to be the primary needs of human in their life. So, which one do you prefer more? Using a credit card? Or using a debit card? Or using both of them to full fill your needs? In fact, using those two cards together is not good for you.
Actually, using only one of them is enough. If you have savings in your bank account, you better use debt card. Why? It is because you do not have to get loans or applying for a credit card to fulfill your financial condition or fulfill your need in urgencies.
But, if you do not have any saving, you better have a credit card as another financial source. You can afford or pay the claim with your monthly salary. But you have to do it routinely because it will avoid you to get arrears of installment. This good habit will make you have a good track record, and it will make your limit increase.
So, all the choice is depends on you. You can choose the one which is the best and appropriate for you. Do not let this advantages deliver you to a bad or the worst financial condition ever. Better choice, better life.