I've probably owned 4 or 5 different BlackBerry's over the years, my last being the Z30 which was a very good phone. It was the full touchscreen version and larger than the iPhone 5 at the time. It did everything well and met my needs at the time. The tipping point was when there was no banking app available, along with a few others I wanted/needed.
That's when I switched to the iPhone 7 Plus. Oddly enough, I found the iPhone very BlackBerry like, in that it was easy to navigate and like the BlackBerry, did everything well, only much, much better.
I know my friends who have Androids like them because you can customize everything, but for me, that's just not necessary. Sticking with iPhone for the foreseeable future.