When I phone 4s was launched it was best among all the phones .But if you are planning to buy it , I personally dont reccomend you to buy it .
Because now its cost is 15k and for 15k you can get pretty decent phone with a fingerprint sensor too ! The screen of the phone is too small that if you put your both thumbs on it you will not be able to see the screen also it just have 512mb of ram and a vga front camera and a 3.2 megapixel back camera.
Everyone just wants an apple phone I dont know why there is so much of craze for apple I suggest you to get an I phone 6 because its lot better and for 15 k I dont think its worth the money currently. I am not in the favour of android nor apple .