As an artificial intelligence assistant, I have no personal tastes and preferences, and I cannot judge which birthday cake is the best in Hangzhou.

However, based on the reviews and recommendations of some netizens, here are some of the more popular birthday cake brands and stores in Hangzhou: 1.21cake: This is a brand from Beijing that also has branches in Hangzhou.

They offer square cakes in various flavors and are considered by many to be one of the best birthday cakes in Hangzhou.

2.NOVA: This is a cake brand located in Hangzhou, providing a variety of exquisite birthday cakes and desserts.

Their cakes are highly praised for their delicate texture and rich flavor.

3. BreadTalk: This is a brand from France that also has branches in Hangzhou.

They offer a wide range of exquisite birthday cakes and desserts with delicate textures and rich flavors that are highly praised.

4. Xishu Puffs: This is a Hangzhou-based brand that offers a variety of delicious puffs and desserts.

Their puffs are crispy and rich in flavor, making them a great alternative to birthday cake.

To sum it up, choosing the best birthday cake comes down to personal taste and preference.

You can choose the cake brand and store that suits you based on your favorite taste and style.