Best part of asus zenfone is quality.
Then comes asus processor which it provides is much better in this price segment.
Then comes asus screen which is a ips display protected with corning gorilla glass v4.Asus camera quality is also the best part of the phone where it provide 13 mp rear camera and 5 mp front facing camera to capture good quality selfies
Asus zenfone is good in battery performance also as it provide 3000 mh battery which last long. Asus zenfone comes with a 3 gb ram hence one can run all big apps like fb smoothly.
Asus zenfone comes with inbuilt memory of 16 gb to store your data and 128 gb expandable memory, so you can carry almost all the data like movies and other necessary data with you. Also you can have dual lte support sim so you can have two different plans on a single phone