If you have other Apple devices (Ipod, Ipad) then the Iphone 5....the devices literally talk to one another.
As a standalone phone, the s4.
If you were smart, however, you would get a Nexus 4G, LG Optimus, or one of the new Blu phones(one of which has a 5.7" inch screen for a mere $300, less than half the price of a Note 2), all of which are great quality and run on Android.