Should I change Portuguese money first or change it after I go to Macau?

I just got back from Macao yesterday. 1. It is suggested that Macao exchange money after closing the gate. Yesterday, the exchange rate was 100 RMB 122.4 Portuguese, the same as that of mainland banks. Remind me, don't change here in Gongbei Zhuhai. Not cost-effective. If you want to change it, you should change it in Macao. In addition, there are many places where you can swipe your card. You only need to change a few hundred dollars in petty cash. Pay by unionpay instead of VISA. When you buy something, you pay in MOP. Your bank will immediately convert it into RMB according to the exchange rate of the day, and you will receive a text message. 2. The things that Macao is cheaper than Guangdong are mainly daily necessities, cosmetics and medicinal oils, which are worth buying. I bought a lot yesterday. I feel that the quality of many things in Macau is better than that in Chinese mainland. I really suggest buying them there at a higher price. After all, there are many fake houses in Chinese mainland, provided that you have enough physical strength to move things, because it is best not to go there on Saturday and Sunday after customs. Like the peak in Spring Festival travel rush, it takes about 2 hours to go through the customs.