Actually, I'm on iOS 9.2 and I haven't had my phone lockup, crash, or over heat. Battery life is also really good. I'm not an Apple fanboy by any stretch of the imagination. The only Apple products in our house are four iPods and my iPhone. I have NO intention of getting a Mac or Apple TV or any of Apple's other products. My wife's phone is a Galaxy S5 and she has a Surface Book. My daughter seems to be the Android fan. She specifically said she did NOT want an iPad (which I was pleased to hear).
I actually think Windows is the superior OS. It's smooth, easy to use, customizable, and I could do things that neither iOS or Android didn't (and still doesn't).
The biggest problem with Windows Mobile OS is the lack of app support. When Microsoft figures out how to get developers on board with W10M, then I'll probably go back. Until then, I'll be happy with my iPhone 6s Plus...which by the way, works better with my Surface Pro 3 and HP desktop better than Android does. Oh, and I haven't abandoned Android completely, I still have a Galaxy Tab S2 (Nook edition); which I like.
Btw, my M9 is Verizon. When is Verizon expected to push out the update?