Hi! I'm looking to buy a power bank for my iPhone X. I have already reviewed several manufacturers' products, but I can't decide which product is the best for my phone. The capacity of the power bank should be between 10.000 mAh and 22.000 mAh. I want the power bank to have a power delivery function. If the product do not have this feature it is not a big problem, but I would be glad. The quality is very important for me. How do I know which one is the best choice? Please recommend.