UOB one card.
It will be easy to hit $500 or $1000(if you have other spending) for every month.
Quarterly cashback is awarded on the fourth month and will offset your fourth month credit card bill.
And if you have the UOB one account, you already achieved the basic criteria to get the high interest saving account.
09 May 2019
If you are looking for cashback rebate, UOB one card will be a good choice or SCB unlimited cashback card is a good option too. And for UOB one card, as mentioned by ying hua, if you credit your salary with your credit card spendings you will be able to enjoy higher interests up to 3.88% capped at 75k sgd. Howevery if you are looking for a miles card, you may want to check out this link here https://www.moneysmart.sg/credit-cards/air-miles