Tmall Global is better for health,
beauty, and mom & baby products because they tend to be lighter products that are easier to ship, and Chinese customers are more likely to value foreign brands for these product categories. There are also additional product testing requirements for health & beauty products which make it difficult to sell through normal trade channels.
For other categories such as food and beverage and fashion apparel, Tmall is better because customers are more likely to want to try these products in person before making a purchase, meaning that brands selling these products will likely have to set up a Chinese entity and sell in offline retail stores.