BB10 is superior to android in many forms. In part due because they had to build into the OS many features that other have via 3rd parties that no one ever made for them. I own a z10 and i've tried Nexus 5X to try to sub it, but it just doesn't have the same versatility (of course, you can upgrade your experience via 3rd party apps), and to be honest the android emulator on bb10 works fairly good.
That being said, i can't imagine a better way to embrace the new paradigms of android world than holding hands with blackberry. I know the gods of smartphones dont smile to them as of lately, but i guess when my phone brakes of, that is the way to go. I just hope for all that is sacred that this works. I don't see the appeal to an iphone device.