You'll have to back up your "shit app store" claim in regards to Windows Phone... I decided try out all-MS with the purchase of a Nokia Icon last year and the integration has been phenomenal. I've also noticed only one bug (in IE of course), and the phone rarely restarts itself like my Droid Maxx often does. Rudy Huyn also creates solid clones of every single popular Andy/iOS app.

The UI is cleaner, Nokia Maps > Google Maps especially for Navigation (full GPS offline nav has saved me more than once), complete MS Office app integration, Outlook email client is slick, camera is better than Android/iOS, OneDrive integration works perfectly. I've been very surprised at how well executed it is, and 8.1 promises to be even better with Cortana, etc.

To date I've had one app that didn't have an equivalent from WinPhone devs, that was the Amazon Seller App. Then again, I don't spend time playing phone games so I'm not the target market. I keep a Droid Maxx around in case there's a niche app I absolutely must use.