Which one is better- Windows or os- nokia lumia 520 or apple iPhone (3gs)?

Which one is better--- Windows or os-- nokia lumia 520 or apple iPhone(3gs)?

Lumia. I have Nokia 822.It amazing.

My brother purchased nokia lumnia 520 ten days back. Its cost is less and has advanced features. Nokia lumia 520 is the best choice.

I'd definitely recommend the Nokia Lumia 520.

You get newer software - the iPhone 3GS will not receive iOS 7; the Lumia 520 still has at least 1.5 years of software updates coming to it. A greater number of apps will be incompatible with iPhone 3GS going forward. Lumia 520 also runs much faster and smoother. Lumia 520 has Facebook, Twitter, Xbox, Office and Skype built in. There's Nokia Music for completely free and unlimited music mixes, and the world's best maps. The home screen is more customisable, to organise all your favourite people, apps and information.

The hardware is also better. You get a superior camera (5MP with 720P HD video capture), a larger screen with higher sensitivity and higher resolution. They have the same storage, but the Lumia 520 has expandable memory. There's faster 3.5G data speeds and newer Wi-Fi technology.

Hope this helps!