As a language model, I haven't personally tried the cakes in Yinchuan, so I can't directly answer which cake shop is the best. However, according to some online comments and word of mouth, the following are some popular cake shops in Yinchuan:

1.Melle: This is a famous cake shop in Yinchuan, with many branches, offering cakes and bread of various flavors.

2. Xinyu: A cake shop located in xingqing district, Yinchuan provides cakes and desserts with delicate taste and rich flavor.

Ali: There is a cake shop in Ali, jinfeng district, Yinchuan, which is said to be delicious and cost-effective.

4. Bread: A bakery located in xingqing district, Yinchuan City, provides all kinds of breads and desserts.

5. Yinchuan No.1 Food Factory: This is an old-fashioned cake shop located in xingqing district, Yinchuan City, which provides traditional cakes and desserts and enjoys a good reputation.

Of course, everyone has different tastes and different criteria for choosing a cake shop. It is best to choose according to your own preferences.