I have a question. I'm actually contemplating whether to use my 2 cards when I'm travelling, or to bring more cash. As I know that there may be some fees imposed when you put through transactions with other currencies besides the exchange rate. Can anyone enlighten me with more information about how it works?

I don't wanna go travel thinking I got the item cheaper than m'sia and in the end check my bill to realize it is actually about the same price after the conversion from the bank and also the transaction fee or sth.