Maybank, because:

1) easier to locate ATM

2) credit cards, Maybank 2 cards and FCB visa just right for me to cover all my monthly expenses with RM100 cash back monthly

For the past 10 years, only use Maybank, cause of convenience (many branches and ATMs). Now seldom use cash and mostly internet banking, so I put my money in OCBC and Standchart for their higher saving interests. I also have CIMB, that only for direct salary deposit, and their preferred lounge.