If you are referring to the xiaomi powerbank 2 then it should out-perform the RAVpower by a great margin. The Ravpower uses 3x 18650 cells and normally powerbanks this type have peak efficiency around 85% delivering ~30Wh on the output side. The Xiaomi uses high density 3.85V LiPo and paired with the high efficiency boost chip it will put out up to 36Wh. That is about 20% extra output while having the same capacity rating.
Here I reviewed the xiaomi and in my opinion this is one of the best 10,000mAh powerbank money can buy.