The Moto Z and latest iPhones tackle the smartphone from opposite directions. Motorola's new handset may be the simplest and most logical take on the modular smartphone to date, adding new looks or features just by snapping on a back plate. The most recent iPhones, meanwhile, have shied away from such bold changes – instead conservatively evolving the world-changing formula from Apple's 2007 original. Can Motorola's flagship shake up smartphone industry stagnation? Let's start by seeing how the Moto Z compares to the iPhone 6s Plus.