What are the advantages of UPS in Ke Hua compared with Costar and Eastman in China?

Usually, I see more co-stars and Easytor. Costar seems to have more outlets. It is said that it is the best seller in China, and Easytor is also quite good. This kind of thing is good, stable and easy to use, and the right price is the last word. No one can say that it is good to buy expensive electronic products, but some brands have better workmanship and components, and the probability of failure is smaller.