Deciding between UOB Absolute Cashback card or Citibank Cashback card

Make things simple,

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Get UOB absolute, then top up to your GrabPay.

Citibank Cashback+ is a better option strictly in terms of the signup rewards. It loses out to UOB Absolite in cashback %, and the procedure today redeem your cashback is unbelievably archaic. You have to send an SMS to Citibank every month telling them how much cashback you want to redeem, and it can only be redeemed in blocks (ie $10 amounts). This means you'll likely have cashback you end up not being able to use.

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UOB Absolute may not offer very attractive rewards, but you can simply top up to GrabPay to qualify. Stacking your payments with GrabPay also let's you earn up to 2.9% cashback, which is significantly higher than 1.6% with Citibank. You're also able to essentially use your credit card even for QR payments since GrabPay supports PayNow and GrabPay QR, which means more flexibility for you. And thankfully, cashback is automatically used to offset your following month's statement.