1) smaller size fits better in the pocket (also, more pixels) 2) Please make a list of the highly CPU intensive applications you need to run, so we can advise 3) life proof: review basically says that the N9 has what you need out of the box. That will probably work for the next two years, when you'll change your phone anyway. After 3 years, the GS2 won't be supported either (Android will, but what good is that to you?) 4) aahhh, you're in the US... more expansive, no warranty.. well that's definitely a strong point. Some more important points: GS2 has way better media decoding than the N9 GS2 has flash