App gap is a huge thing.
Even just from iOS to Android. I cannot find a good sound pressure level app on Android, I have tried lots, many are poor. There are 3 good apps for iOS only, Can't get any on Android.
Now imagine me trying to find an app like that on Windows store. Nobody is developing for it because the market just is not there.
Also, is the hardware as fancy looking as the iOS/Droid counterparts. The Lumia series was alright but it kept missing the "wow that is awesome" feeling.