Android 4.0 or higher supports audio over usb. You just need a otg cable. I run note II to Apex amp/dac (via otg cable) to PSB headphones. Sounds spectacular.
Smartphone for the audiophile?
Android vs Iphone. Is the Iphone the obvious/only choice? I am thinking in terms of pc audio control apps, direct streaming, plug in portable hi fi, mobile ipod music, in vehicles, internet radio, output to DACs etc. I realise this question depends on many factors, but in general, which serves the audiophile better, and why?