There are many issuers who offer a cash back credit card but selecting the best cash back card is just very hard because all the banks and financial institutes offer credit cards almost with the same terms and conditions and reward points.
While selecting the best cash back card, you must consider how much cash back you are going to earn on the card. Many cards earn points only on specific purchase. Si it also should be confirmed if the card is giving this facility on all type of expenditures. In Singapore, you can rely on Maybank2u for best cash back card.