^That. Most of Apple's hardware is designed and made specifically to work in conjunction with their OS, and because they are the only ones able to create phones using that OS, there is no variation. Android devices, on the other hand, come in many varieties, from as many manufacturers, and each one decided to put their own little spin on the OS. Its hardware components end up looking like a Frankenstein monster next to Apple's. That all adds up to it being not nearly as efficient or uniform. It's a small price to pay for a little variety though.