I think for standard everyday cashback (except topping up e-wallet) without too much hassle, you can go for  Maybank Barcelona: 2% all (almost) transactions capped at RM50/ month, boost up to 10% and capped at RM100 for May and August. Total wopping RM700 cashback with fairly easy-met conditions.

As for e-wallet, I think topped the chart should be PB Quantum - I dont have one, stil reading through the details. Combo it with Boost, BigPay or Wechat (not sure if the later 2 worked, wechat has 0 charges on withdrawal)

Info:
- Bigpay withdrawal details: https://www.bigpayme.com/faq-bank-transfer
- Boost withdrawal details: https://support.myboost.com.my/hc/en-us/art...y-bank-account-

I may not have all the info to compare, looking forward if someone can correct me if I am wrong. Cheers.