I m using the Cimb visa infinite, all transactions are subject to 0.5%/1% rebates, no need to remember which merchant codes and monitor the credit use per month. No cap on the rebates more straight forward to me.

Those cash return 5% are not exactly 5% based on the actual transaction amount, many formulas and cap assigned to each category. Very difficult to monitor for me

I m referring to Rhb smart value card, previously called travel money. They used to have online calculator to work out how much total spend, petrol spend, utility spend and etc.

For Cash rebates.
Tesco online and Tesco retail different rebates, for instance

yes, it is just a marketing gimmick.
i subsribed directly to agoda newslatter. Everyweek i receivced the private sales/ insider deals banner. From the link that provided in the newsletter, i get better deal compared to the agoda/cimb link.

Plus agoda coorporate with all the banks in Malaysia, no exlusivity at all