Asus zenfone 3s ZC521TL is better for only its battery backup because its battery capacity 5000mAh that is unbliveable . otherwise it`s rom only 3gb and rom only 32gb and processor only 1GHz octa-core thats not good. ts`s resolution 720 x 1280 pixels lower grade product it is. back camera 13 megapixel amd front camera 8 megapixel that is better but performence not better. it`s weight 175g so it is not caryable for a person. display 5.20 inch so perfect size . OS android 7.0 and no GPS . it looks so beautiful and value of market is low. market price of money is high. its features are not better like another phone of market.