Pick a few classic brands and recommend them to you.
Desktop milk tea: coco, a little
Hong Kong-style milk tea: Letangkou and Mizhilian
In terms of reliability, these brands are all right.
On the cheap side, Letangkou and Mizhilian are cheaper, because Hong Kong-style milk tea is on the rise, and the earlier it is, the more affordable it is.
In terms of learning, Letangkou and Mizhilian are also better, because Hong Kong-style milk tea has high technology content, while desktop milk tea has no technology.