Perhaps you're in a bubble of your own.
Besides my iPhone 6 Plus, I am currently using a Nexus 5, 6, 7, as well as a Moto X Pure. Four Android devices that are fast, smooth as silk, and completely crash free. Something that cannot be said about my iP6+. Those are just the facts that I experience with my devices. Notice I am not bashing the iPhone, it is what it is. I still like it, even if it doesn't perform well enough to be my primary phone, I always use one Android and one iPhone concurrently anyway. Have been for years.
Being the tech guy for my family, we have countless iPhones and Androids, the only hard core Apple enthusiast is myself. I maintain all our phones and find that we have over 12 Androids that like mine are fast smooth and trouble free. This is no longer 2011 when Android was less than what it is today.