Testing for yourself is the only way of really finding out.. Your tastes and preferences will differ from the next man or woman What he said! I am not too sure on the iPhone but are you able to playback all fie types,ie FLAC, WAV, DSD? Would using something like Onkyo HF Player work with the inbuilt DAC of the iOS devices? Are you able to add additional storage? Again everyones needs differ and those who are happy with their iPhones may not need these things mentioned above, or need a mobile device that can also be connected to a PC or be used in a stand alone home system. Or the ability to drive most headphones. But the decision can only ever be yours.