I choose ARC simply coz of its fantastic appearance..
It's even nicer than the newest XPERIA S
For hardware, Sony's handphone's hardware is always not up-to-date. But u guys still choose Sony, right?
actually, i choose my arc s because of the ericsson part, not the sony. I unlocked bootloader and upgraded to ics but ended donwgrading to gb for the speed and stability and i'm very satisfied with my phone.