From my own experience, I'd say WP is more user-friendly than iOS, at least when the Live Tiles bother working properly, but iOS is the undisputed king in the apps market (despite Apple's stupid $100/year developer licence). But the walled-garden ecosystems of iOS and WP kills both for me. iOS has jailbreaking to alleviate this to some extent, but in a country where broadband availability is s*** (sorry, but there is no other word to describe it), I regularly need my phone at weekends to download college files from the Internet and transfer them to my computer. So I regularly have to go back to my six-year-old Nokia E51 for that, which can be a pain. Next phone, I'll probably go for an Android (or possibly Ubuntu, depending on price/availability).