Hi Arunabha and welcome to the forum.
The reason that I deleted my post was that I realised that I was not really qualified to help you.
I have a little more experience with in ears than full size headphones and have not heard the Touch.
I can only really suggest using the search function here to do a bit of research and if at all possible have a listen to stuff before you buy.
With full size headphones it should be easy to buy mail order and return if you make a mistake.
The iPhone 6 is highly regarded around here as a music source.
The 6S seems to have issues with the audio which affect some people and not others.
As I say I have not heard the Touch.
Do you want a portable set up for listening on the move or is this for home use?
Hopefully someone else with more knowledge will come along and give you better advice.
Quality music choices BTW.