Debit card to use

Depends. i reduced to 3 main cards to manage more effectively.

As long as you are not paying any fee.., you can maintain it as it is... unless there is some specific reason for closing....such as difficult to manage all requirements...for higher interests..

Would suggest to leave those cards alone until the banks refused to waive the annual membership fee.

Not sure about UOB One rewards programme.

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if the main usage on shopee food & phone bills you can try Citibank Rewards but this is just my personal opinion so take it with a pinch of salt