Depends on how much you like your apps though... "There's an app for that..." oh wait there's not.
This is very true, the windows store has most (and I say most fairly loosely) of the popular apps. Its improving all the time, so if you can put up with not having some apps available then its an ok choice. Guess it depends on the type of user you are.
The biggest reason for me, IF i was to get a Win Phone, would be the 20Mb Pixel camera on the Lumia 950. It takes very good photos.