I'm about to roll back to WM...
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After my first traditional Nokia phone in 2003, I bought an HTC with WM 6 or so. Next, iPhone 3S (3G?), iPhone 4s, then Lumia 920, and now Samsung Note 3. None of them have been perfect.
* iPhone: good apps, don't like iOS upgrade policy (deleted songs, bricked iPad 2, etc), lacks file system, how to turn off Siri?
* Android: many apps, in general not good quality, hate the push to install various apps (Samsung, Android, etc), poor battery life ( last 6 months: perhaps 4 hours of intense web browsing), etc.
* WP 8: good Office/Outlook/mail client. Few apps, but most of what I needed. Lumia 920: solid build quality, heavy. My first Lumia: spent half of the first 6 months back and forth between myself and the workshop. After I finally got a new one, the experience was much better. Battery life? Some 4 hours with 4G, 8hr with 3G.