annual fee for gsc card can be waived with 12 swipes in a year.

before you get it, i suggest you to read through this link: https://www.hlb.com.my/main/personal/cards/...-and-plat-cards
study the tables and understand how the discount works before you sign up blindly.
if you still like it, then only go for it. 

mbb2amex is more straight forward, as long as the merchant acccept amex, you can get 5%+5xtp (weekends) or 5xtp (weekdays).
hlb wise is depending on merchant code + their strict t&c requirements, but if you able to play by the rules, you can get 10% everyday.