Notes for Table Above based on Low Yat Net forum members' comments:
1. OCBC Titanium offers 5% for utilities. AMEX Gold CC 2.5%.
2. HLB Essential do not enjoy cash back for petrol.
[Update 19 June 2011: click here to see table comparing cash back for UOB One Card, MBB 2 Amex, OCBC TMC and Citi Plat Cash Back]
For your information, OCBC Platinum card also offer Cash Back but the rate is only 0.5% for all transactions but it is not capped like the Titanium Card. Same goes for CIMB/Direct Access Visa Infinite where it gives 0.5% cash rebate and 1% for overseas transactions. Banks are now offering cash rebate instead of gifts. I guess it is cheaper for them cost wise as compared to engaging a third party for the gift program, printing the gift booklet and sending it out, updating the gift website yearly etc etc.