Which Credit or Debit Card gives the best rebate?

1. Citibank Dividend Card - gives a total of 8% discount to petrol at Esso, if including the usual on-site 5%, it will be a total of 13%, the best so-far in town. It also gives 2% rebate to dining and groceries and 0.5% rebate for all other spending.
2. Standard Chartered Prudential Platinum Card - good for holders of Prudential policies, as it gives a 0.9% rebate for all spending, which you can use it to deduct from your premium.
3. UOB One Card - gives a rebate of $30 for 3 consecutive months of $300 monthly spending, and $80 for 3 consecutive months of $800 monthly spending, which works out to a 3% rebate.
4. Standard Chartered Xtra Saver Account Debit Card - gives a rebate of 0.5% for all Nets spending, and 2% rebate (if no rebate on petrol, with it its 1%) for all overseas spending on its debit mastercard. It also gives discount for spending on petrol, with a total rebate limit of up to $300 monthly.