I would say totally depending on your needs.

I would go for Nokia Lumia 920 because what I'm aiming for is a good camera phone with a very very smooth UI surface, and BIG screen.
I won't go for Android even when Note 2 is really attractive to me, I just can't accept the lagness of the OS.
I will not go for iOS either, to me, getting an iDevice, it MUST be big, there is no point playing on an iPhone which screen is so small when you can enjoy the HD version on the iPad, why iPhone when you can get iPad which is so much cheaper?

I'm a N9 user btw :P