good day guys, so i was preparing for US working trip soon and found out about this foreign transaction charges and got myself a bit mindfk

please enlighten me as MYR - US is pretty bad currently.

i got to know from MBB customer service, my amex/visa admin charges are 2.5 and 2.25% respectively.
then OCBC 1%

but when i read thru the pages here, i noticed that most of the ppl use MBB ? is there something i don't see here?

i just have below card, so if you can help me decide which one to use and which one prepare for emergency only thank you!
1. OCBC (Master and Visa)
2. MBB (Visa and Amex)