The app gap got to me about a year ago when I absolutely had to have apps for my business and they simply were not on Win Phone and they were no workarounds. I loved my Icon but had no choice so I moved to an iPhone 6+. I kept the Icon active since then with great hopes for Win 10, but I'm now ready to cut that line and save the funds.
In response to some comments I've seen here, the battery life on the iPhone is excellent. I use between 20 and 40% in a day, and recharge every night. That is with active messaging and phone calls throughout the day. The Icon, with the current Win 10 version, will drop 50% of the battery in 4 hours with no background processing and virtually no use other than a couple of live tiles. The store updating can drain 20% in minutes, and it must be left plugged in when doing a system update or it will completely drain the battery.
Every member of my family has an iPhone. Some because their work provides them, others because they use other Apple products. All of us select our phone because of functionality meeting our needs, not because of brand or fandom. The iPhone has its quirks, but overall it works and it has the functionality I need. I wish I could have stayed with WinPhone. I loved the integration of apps, the start layout, and the camera. In fact I still carry the Icon to take photos, though the camera app has been annoying in Win 10 with slow response time and failure to take photos some times.
I'm still a big supporter of Microsoft, but the Win Phone is just not a viable alternative at this time, even with the special features for my Band not yet available on the iOS Health app. For those who disrespect iOS, it's stable, the apps are more secure, and support at the Apple Store far exceeds any hope of support from the carrier when issues do arise.
And for the inevitable commenter who challenges me on the "app is not available" comment: One of my jobs is selling real estate. The lock box key is an app on my phone. It is not available on Win Phone and will not be available in the foreseeable future. That is major since it is how I show clients homes. No key, no entry, no sale, no clients ! That is one of many ...