Personally I would never opt for a Windows device that connects to the internet. I kind of like Windows, as long as it is not connected and it seems to be a pretty stable OS, that way. Or at least, it works for the machine I play games on, use to photoshop and make electronic music.

So, for me, I would take an N9 any day over any other smartphone device.

That does not seem to be a generally accepted opinion though...

Have a look
http://versusio.com/en/nokia-lumia-820-vs-nokia-n9

And just for a specs comparison
http://www.thephonedatabase.com/Noki...Compare_Phones