In summary, you should use a credit card for all purchases that you are able to pay off in full each month, in order to take advantage of credit card benefits such as rewards or cash back, fraud protection, and extended warranties. Not to mention it builds your credit. You should use a debit card for purchases that you are unable to make on your credit card, or if you are worried about overspending and want to avoid going into debt. It’s important to consider your own financial situation and habits, and choose the payment method that works best for you.