Overall, shopping in Macau is indeed cheaper than in mainland China. One reason is the exchange rate advantage, and the other reason is that there are many duty-free shops in Macau.
Duty-free shops are concentrated in Sands Shopping City, which houses sasa, DFS, DFA, etc., including beauty and skin care, luxury goods, and electronic products.
The overall shopping environment in Jinsha is also better. They are all large and comprehensive malls. Several malls are connected and there is a lot to eat. There are many Michelin Black Pearl restaurants and there is a food court that is friendly to the people.
So when shopping, just go there and buy it without having to run around.