Currently, I am having the cash rebate credit card from Bank C and Bank O.
I just received my new Bank O's card in December 2013 for 1% rebate for whatever retail charges into the card. I have been holding Bank C's for three years and it provides 5% rebate on petrol, 2% rebate on mobile phone bills & hypermarkets' shopping while only 0.3% rebate on other retail spending. To optimize the rebate to be received, I have diverted other credit retail charges to Bank O's card to enjoy higher return.