Nokia Lumia 925 hands down. As with iOS, you don't need quad core processors and 2 gb of ram to run the OS (but it's icing on the cake when you have one). Android UI's app dependent; iOS and Windows 8 UI priority over apps so these phones run smoother, faster and without any hitches that you see with Androids, including the newer N5, G2, etc. Best smartphone is the iPhone 5S but way overpriced and smaller 4" screen; next best is the Nokia series and the 925 isn't a slouch. I own one of them and an 810 - these phones are awesome plus you get great cameras and Nokia apps which are much better than Google (Maps, Drive, Music, etc). This is a no brainer for me since I've owned and used all the mobile OS (N4, G2, S4, Sensation, etc) except for BB - Windows 8 is awesome!