The customer choices of McDonald's, Pizza Hut and Starbucks are as follows:

1. McDonald's: Its main customer groups include fast-paced office workers, students, children and housewives. McDonald's mainly focuses on fast food such as hamburgers and French fries, and has a certain children's market.

2. Pizza Hut: Its main customers include fast-paced office workers, students, housewives and some teenagers. Pizza Hut mainly serves fast food such as pizza and pasta, and also provides some desserts and drinks.

3. Starbucks: Its main customer groups include busy office workers, students, young artists and some people who like to enjoy life. Starbucks, on the other hand, mainly focuses on coffee, tea and some snacks. Its indoor environment is comfortable and it provides free wireless internet service, so that customers can work or rest in the store.